InvalidSignatureException with Apps mounted by volume

After injecting my apps through a volume, I started to receive InvalidSignatureException for all of them. I’m being notified that apps don’t have siganture.json file. However, before I moved the apps to an external volume, they didn’t have this file either. I read some reports that this could be linked to TIMESTAMP associated with the app files, but I have already realized all possibilities, but none have been successful. Could someone explain to me what’s going on? Thank you very much in advance.

Nextcloud version: 19.0.4
Running in docker container, based on php:7.4-apache-buster image.
PHP version: 7.4.13

Here is the technical report

Technical information
=====================
The following list covers which files have failed the integrity check. Please read
the previous linked documentation to learn more about the errors and how to fix
them.

Results
=======
- core
	- EXCEPTION
		- OC\IntegrityCheck\Exceptions\InvalidSignatureException
		- Signature data not found.
- provisioning_api
	- EXCEPTION
		- OC\IntegrityCheck\Exceptions\InvalidSignatureException
		- Signature data not found.
- cloud_federation_api
	- EXCEPTION
		- OC\IntegrityCheck\Exceptions\InvalidSignatureException
		- Signature data not found.
- federatedfilesharing
	- EXCEPTION
		- OC\IntegrityCheck\Exceptions\InvalidSignatureException
		- Signature data not found.
- accessibility
	- EXCEPTION
		- OC\IntegrityCheck\Exceptions\InvalidSignatureException
		- Signature data not found.
- recommendations
	- EXCEPTION
		- OC\IntegrityCheck\Exceptions\InvalidSignatureException
		- Signature data not found.
- systemtags
	- EXCEPTION
		- OC\IntegrityCheck\Exceptions\InvalidSignatureException
		- Signature data not found.
- theming
	- EXCEPTION
		- OC\IntegrityCheck\Exceptions\InvalidSignatureException
		- Signature data not found.
- twofactor_backupcodes
	- EXCEPTION
		- OC\IntegrityCheck\Exceptions\InvalidSignatureException
		- Signature data not found.
- password_policy
	- EXCEPTION
		- OC\IntegrityCheck\Exceptions\InvalidSignatureException
		- Signature data not found.
- viewer
	- EXCEPTION
		- OC\IntegrityCheck\Exceptions\InvalidSignatureException
		- Signature data not found.
- notifications
	- EXCEPTION
		- OC\IntegrityCheck\Exceptions\InvalidSignatureException
		- Signature data not found.
- updatenotification
	- EXCEPTION
		- OC\IntegrityCheck\Exceptions\InvalidSignatureException
		- Signature data not found.
- lookup_server_connector
	- EXCEPTION
		- OC\IntegrityCheck\Exceptions\InvalidSignatureException
		- Signature data not found.
- files_rightclick
	- EXCEPTION
		- OC\IntegrityCheck\Exceptions\InvalidSignatureException
		- Signature data not found.
- files_videoplayer
	- EXCEPTION
		- OC\IntegrityCheck\Exceptions\InvalidSignatureException
		- Signature data not found.
- privacy
	- EXCEPTION
		- OC\IntegrityCheck\Exceptions\InvalidSignatureException
		- Signature data not found.
- files_pdfviewer
	- EXCEPTION
		- OC\IntegrityCheck\Exceptions\InvalidSignatureException
		- Signature data not found.
- files_sharing
	- EXCEPTION
		- OC\IntegrityCheck\Exceptions\InvalidSignatureException
		- Signature data not found.
- settings
	- EXCEPTION
		- OC\IntegrityCheck\Exceptions\InvalidSignatureException
		- Signature data not found.
- workflowengine
	- EXCEPTION
		- OC\IntegrityCheck\Exceptions\InvalidSignatureException
		- Signature data not found.
- federation
	- EXCEPTION
		- OC\IntegrityCheck\Exceptions\InvalidSignatureException
		- Signature data not found.
- sharebymail
	- EXCEPTION
		- OC\IntegrityCheck\Exceptions\InvalidSignatureException
		- Signature data not found.
- logreader
	- EXCEPTION
		- OC\IntegrityCheck\Exceptions\InvalidSignatureException
		- Signature data not found.
- text
	- EXCEPTION
		- OC\IntegrityCheck\Exceptions\InvalidSignatureException
		- Signature data not found.
- files_external
	- EXCEPTION
		- OC\IntegrityCheck\Exceptions\InvalidSignatureException
		- Signature data not found.
- files_trashbin
	- EXCEPTION
		- OC\IntegrityCheck\Exceptions\InvalidSignatureException
		- Signature data not found.
- photos
	- EXCEPTION
		- OC\IntegrityCheck\Exceptions\InvalidSignatureException
		- Signature data not found.
- files
	- EXCEPTION
		- OC\IntegrityCheck\Exceptions\InvalidSignatureException
		- Signature data not found.
- nextcloud_announcements
	- EXCEPTION
		- OC\IntegrityCheck\Exceptions\InvalidSignatureException
		- Signature data not found.
- oauth2
	- EXCEPTION
		- OC\IntegrityCheck\Exceptions\InvalidSignatureException
		- Signature data not found.
- serverinfo
	- EXCEPTION
		- OC\IntegrityCheck\Exceptions\InvalidSignatureException
		- Signature data not found.
- encryption
	- EXCEPTION
		- OC\IntegrityCheck\Exceptions\InvalidSignatureException
		- Signature data not found.
- dav
	- EXCEPTION
		- OC\IntegrityCheck\Exceptions\InvalidSignatureException
		- Signature data not found.
- files_versions
	- EXCEPTION
		- OC\IntegrityCheck\Exceptions\InvalidSignatureException
		- Signature data not found.
- user_ldap
	- EXCEPTION
		- OC\IntegrityCheck\Exceptions\InvalidSignatureException
		- Signature data not found.
- contactsinteraction
	- EXCEPTION
		- OC\IntegrityCheck\Exceptions\InvalidSignatureException
		- Signature data not found.
- admin_audit
	- EXCEPTION
		- OC\IntegrityCheck\Exceptions\InvalidSignatureException
		- Signature data not found.
- comments
	- EXCEPTION
		- OC\IntegrityCheck\Exceptions\InvalidSignatureException
		- Signature data not found.
- activity
	- EXCEPTION
		- OC\IntegrityCheck\Exceptions\InvalidSignatureException
		- Signature data not found.

Raw output
==========
Array
(
    [core] => Array
        (
            [EXCEPTION] => Array
                (
                    [class] => OC\IntegrityCheck\Exceptions\InvalidSignatureException
                    [message] => Signature data not found.
                )

        )

    [provisioning_api] => Array
        (
            [EXCEPTION] => Array
                (
                    [class] => OC\IntegrityCheck\Exceptions\InvalidSignatureException
                    [message] => Signature data not found.
                )

        )

    [cloud_federation_api] => Array
        (
            [EXCEPTION] => Array
                (
                    [class] => OC\IntegrityCheck\Exceptions\InvalidSignatureException
                    [message] => Signature data not found.
                )

        )

    [federatedfilesharing] => Array
        (
            [EXCEPTION] => Array
                (
                    [class] => OC\IntegrityCheck\Exceptions\InvalidSignatureException
                    [message] => Signature data not found.
                )

        )

    [accessibility] => Array
        (
            [EXCEPTION] => Array
                (
                    [class] => OC\IntegrityCheck\Exceptions\InvalidSignatureException
                    [message] => Signature data not found.
                )

        )

    [recommendations] => Array
        (
            [EXCEPTION] => Array
                (
                    [class] => OC\IntegrityCheck\Exceptions\InvalidSignatureException
                    [message] => Signature data not found.
                )

        )

    [systemtags] => Array
        (
            [EXCEPTION] => Array
                (
                    [class] => OC\IntegrityCheck\Exceptions\InvalidSignatureException
                    [message] => Signature data not found.
                )

        )

    [theming] => Array
        (
            [EXCEPTION] => Array
                (
                    [class] => OC\IntegrityCheck\Exceptions\InvalidSignatureException
                    [message] => Signature data not found.
                )

        )

    [twofactor_backupcodes] => Array
        (
            [EXCEPTION] => Array
                (
                    [class] => OC\IntegrityCheck\Exceptions\InvalidSignatureException
                    [message] => Signature data not found.
                )

        )

    [password_policy] => Array
        (
            [EXCEPTION] => Array
                (
                    [class] => OC\IntegrityCheck\Exceptions\InvalidSignatureException
                    [message] => Signature data not found.
                )

        )

    [viewer] => Array
        (
            [EXCEPTION] => Array
                (
                    [class] => OC\IntegrityCheck\Exceptions\InvalidSignatureException
                    [message] => Signature data not found.
                )

        )

    [notifications] => Array
        (
            [EXCEPTION] => Array
                (
                    [class] => OC\IntegrityCheck\Exceptions\InvalidSignatureException
                    [message] => Signature data not found.
                )

        )

    [updatenotification] => Array
        (
            [EXCEPTION] => Array
                (
                    [class] => OC\IntegrityCheck\Exceptions\InvalidSignatureException
                    [message] => Signature data not found.
                )

        )

    [lookup_server_connector] => Array
        (
            [EXCEPTION] => Array
                (
                    [class] => OC\IntegrityCheck\Exceptions\InvalidSignatureException
                    [message] => Signature data not found.
                )

        )

    [files_rightclick] => Array
        (
            [EXCEPTION] => Array
                (
                    [class] => OC\IntegrityCheck\Exceptions\InvalidSignatureException
                    [message] => Signature data not found.
                )

        )

    [files_videoplayer] => Array
        (
            [EXCEPTION] => Array
                (
                    [class] => OC\IntegrityCheck\Exceptions\InvalidSignatureException
                    [message] => Signature data not found.
                )

        )

    [privacy] => Array
        (
            [EXCEPTION] => Array
                (
                    [class] => OC\IntegrityCheck\Exceptions\InvalidSignatureException
                    [message] => Signature data not found.
                )

        )

    [files_pdfviewer] => Array
        (
            [EXCEPTION] => Array
                (
                    [class] => OC\IntegrityCheck\Exceptions\InvalidSignatureException
                    [message] => Signature data not found.
                )

        )

    [files_sharing] => Array
        (
            [EXCEPTION] => Array
                (
                    [class] => OC\IntegrityCheck\Exceptions\InvalidSignatureException
                    [message] => Signature data not found.
                )

        )

    [settings] => Array
        (
            [EXCEPTION] => Array
                (
                    [class] => OC\IntegrityCheck\Exceptions\InvalidSignatureException
                    [message] => Signature data not found.
                )

        )

    [workflowengine] => Array
        (
            [EXCEPTION] => Array
                (
                    [class] => OC\IntegrityCheck\Exceptions\InvalidSignatureException
                    [message] => Signature data not found.
                )

        )

    [federation] => Array
        (
            [EXCEPTION] => Array
                (
                    [class] => OC\IntegrityCheck\Exceptions\InvalidSignatureException
                    [message] => Signature data not found.
                )

        )

    [sharebymail] => Array
        (
            [EXCEPTION] => Array
                (
                    [class] => OC\IntegrityCheck\Exceptions\InvalidSignatureException
                    [message] => Signature data not found.
                )

        )

    [logreader] => Array
        (
            [EXCEPTION] => Array
                (
                    [class] => OC\IntegrityCheck\Exceptions\InvalidSignatureException
                    [message] => Signature data not found.
                )

        )

    [text] => Array
        (
            [EXCEPTION] => Array
                (
                    [class] => OC\IntegrityCheck\Exceptions\InvalidSignatureException
                    [message] => Signature data not found.
                )

        )

    [files_external] => Array
        (
            [EXCEPTION] => Array
                (
                    [class] => OC\IntegrityCheck\Exceptions\InvalidSignatureException
                    [message] => Signature data not found.
                )

        )

    [files_trashbin] => Array
        (
            [EXCEPTION] => Array
                (
                    [class] => OC\IntegrityCheck\Exceptions\InvalidSignatureException
                    [message] => Signature data not found.
                )

        )

    [photos] => Array
        (
            [EXCEPTION] => Array
                (
                    [class] => OC\IntegrityCheck\Exceptions\InvalidSignatureException
                    [message] => Signature data not found.
                )

        )

    [files] => Array
        (
            [EXCEPTION] => Array
                (
                    [class] => OC\IntegrityCheck\Exceptions\InvalidSignatureException
                    [message] => Signature data not found.
                )

        )

    [nextcloud_announcements] => Array
        (
            [EXCEPTION] => Array
                (
                    [class] => OC\IntegrityCheck\Exceptions\InvalidSignatureException
                    [message] => Signature data not found.
                )

        )

    [oauth2] => Array
        (
            [EXCEPTION] => Array
                (
                    [class] => OC\IntegrityCheck\Exceptions\InvalidSignatureException
                    [message] => Signature data not found.
                )

        )

    [serverinfo] => Array
        (
            [EXCEPTION] => Array
                (
                    [class] => OC\IntegrityCheck\Exceptions\InvalidSignatureException
                    [message] => Signature data not found.
                )

        )

    [encryption] => Array
        (
            [EXCEPTION] => Array
                (
                    [class] => OC\IntegrityCheck\Exceptions\InvalidSignatureException
                    [message] => Signature data not found.
                )

        )

    [dav] => Array
        (
            [EXCEPTION] => Array
                (
                    [class] => OC\IntegrityCheck\Exceptions\InvalidSignatureException
                    [message] => Signature data not found.
                )

        )

    [files_versions] => Array
        (
            [EXCEPTION] => Array
                (
                    [class] => OC\IntegrityCheck\Exceptions\InvalidSignatureException
                    [message] => Signature data not found.
                )

        )

    [user_ldap] => Array
        (
            [EXCEPTION] => Array
                (
                    [class] => OC\IntegrityCheck\Exceptions\InvalidSignatureException
                    [message] => Signature data not found.
                )

        )

    [contactsinteraction] => Array
        (
            [EXCEPTION] => Array
                (
                    [class] => OC\IntegrityCheck\Exceptions\InvalidSignatureException
                    [message] => Signature data not found.
                )

        )

    [admin_audit] => Array
        (
            [EXCEPTION] => Array
                (
                    [class] => OC\IntegrityCheck\Exceptions\InvalidSignatureException
                    [message] => Signature data not found.
                )

        )

    [comments] => Array
        (
            [EXCEPTION] => Array
                (
                    [class] => OC\IntegrityCheck\Exceptions\InvalidSignatureException
                    [message] => Signature data not found.
                )

        )

    [activity] => Array
        (
            [EXCEPTION] => Array
                (
                    [class] => OC\IntegrityCheck\Exceptions\InvalidSignatureException
                    [message] => Signature data not found.
                )

        )

)