Nc +e2e encryption broken f.e. in collectives and in files?

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Hello, I now have two instances of NC (32.0.3 deb12 + 31.0.10 Hetzner) with major problems when using E2E encryption. (I have several more instances without encryption that are working fine.)
Simple text posts are created in Collectives and after a random amount of time, they can no longer be read by anyone.

I’ll start with just one (the error messages are almost identical):
NC: 32.0.3 on debian12, nginx, … rented server with ssh access.
About 5 hours ago, I created a short text file in Collectives with two screenshots integrated.
Now neither I as the owner nor anyone else can access the text.
The images are visible in a separate menu

How can I reshare a file in a collective as named in the log?

The Basics

  • Nextcloud Server version (e.g., 29.x.x):
    • 32.0.2
  • Operating system and version (e.g., Ubuntu 24.04):
    • debian12
  • Web server and version (e.g, Apache 2.4.25):
    • nginx

Summary of the issue you are facing:

not accessible textfile in collectives and same in files.

  1. Log entries

{“reqId”:“zp1RkX0i8WYeO1XrZUdP”,“level”:3,“time”:“2026-01-13T18:08:09+00:00”,“remoteAddr”:“x.x.x.x”,“user”:“cloud”,“app”:“encryption”,“method”:“GET”,“url”:“/remote.php/dav/files/cloud/Kollektive/yyyy/Readme.md?timestamp=1768327688",“message”:"Cannot decrypt this file, probably this is a shared file. Please ask the file owner to reshare the file with you.”,“userAgent”:“Mozilla/5.0 (X11; Linux x86_64; rv:140.0) Gecko/20100101 Firefox/140.0”,“version”:“32.0.3.2”,“data”:{“app”:“encryption”}}

{“reqId”:“zp1RkX0i8WYeO1XrZUdP”,“level”:3,“time”:“2026-01-13T18:08:09+00:00”,“remoteAddr”:“x.x.x.x”,“user”:“cloud”,“app”:“webdav”,“method”:“GET”,“url”:“/remote.php/dav/files/cloud/Kollektive/Gyyyy/Readme.md?timestamp=1768327688",“message”:"Cannot decrypt this file, probably this is a shared file. Please ask the file owner to reshare the file with you.”,“userAgent”:“Mozilla/5.0 (X11; Linux x86_64; rv:140.0) Gecko/20100101 Firefox/140.0”,“version”:“32.0.3.2”,“exception”:{“Exception”:“OC\Encryption\Exceptions\DecryptionFailedException”,“Message”:“Cannot decrypt this file, probably this is a shared file. Please ask the file owner to reshare the file with you.”,“Code”:0,“Trace”:[{“file”:“/var/www/html/nextcloud/lib/private/Files/Stream/Encryption.php”,“line”:461,“function”:“decrypt”,“class”:“OCA\Encryption\Crypto\Encryption”,“type”:“->”,“args”:["*** sensitive parameters replaced “]},{“file”:”/var/www/html/nextcloud/lib/private/Files/Stream/Encryption.php",“line”:260,“function”:“readCache”,“class”:“OC\Files\Stream\Encryption”,“type”:“->”},{“function”:“stream_read”,“class”:“OC\Files\Stream\Encryption”,“type”:“->”},{“file”:“/var/www/html/nextcloud/3rdparty/icewind/streams/src/Wrapper.php”,“line”:54,“function”:“fread”},{“file”:“/var/www/html/nextcloud/3rdparty/icewind/streams/src/CallbackWrapper.php”,“line”:94,“function”:“stream_read”,“class”:“Icewind\Streams\Wrapper”,“type”:“->”},{“function”:“stream_read”,“class”:“Icewind\Streams\CallbackWrapper”,“type”:“->”},{“file”:“/var/www/html/nextcloud/3rdparty/sabre/http/lib/Sapi.php”,“line”:108,“function”:“stream_copy_to_stream”},{“file”:“/var/www/html/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php”,“line”:490,“function”:“sendResponse”,“class”:“Sabre\HTTP\Sapi”,“type”:“::”},{“file”:“/var/www/html/nextcloud/apps/dav/lib/Connector/Sabre/Server.php”,“line”:211,“function”:“invokeMethod”,“class”:“Sabre\DAV\Server”,“type”:“->”},{“file”:“/var/www/html/nextcloud/apps/dav/lib/Server.php”,“line”:424,“function”:“start”,“class”:“OCA\DAV\Connector\Sabre\Server”,“type”:“->”},{“file”:“/var/www/html/nextcloud/apps/dav/appinfo/v2/remote.php”,“line”:22,“function”:“exec”,“class”:“OCA\DAV\Server”,“type”:“->”},{“file”:“/var/www/html/nextcloud/remote.php”,“line”:151,“args”:[“/var/www/html/nextcloud/apps/dav/appinfo/v2/remote.php”],“function”:“require_once”}],“File”:“/var/www/html/nextcloud/apps/encryption/lib/Crypto/Encryption.php”,“Line”:315,“Hint”:“Diese Datei kann nicht entschl\u00fcsselt werden, es handelt sich wahrscheinlich um eine geteilte Datei. Bitte den Eigent\u00fcmer der Datei kontaktieren und ihn darum bitten, die Datei noch einmal zu teilen.”,“message”:“Cannot decrypt this file, probably this is a shared file. Please ask the file owner to reshare the file with you.”,“exception”:{},“CustomMessage”:“Cannot decrypt this file, probably this is a shared file. Please ask the file owner to reshare the file with you.”}}

…

Apps

The output of occ app:list (if possible).

sudo -u www-data php ./occ app:list

Enabled:

  • activity: 5.0.0-dev.0
  • admin_audit: 1.22.0
  • app_api: 32.0.0
  • auto_groups: 1.6.2
  • bruteforcesettings: 5.0.0-dev.0
  • calendar: 6.1.4
  • circles: 32.0.0
  • cloud_federation_api: 1.16.0
  • collectives: 3.5.0
  • comments: 1.22.0
  • contacts: 8.2.0
  • contactsinteraction: 1.13.1
  • dashboard: 7.12.0
  • dav: 1.34.2
  • deck: 1.16.3
  • encryption: 2.20.0
  • event_update_notification: 2.7.0
  • federatedfilesharing: 1.22.0
  • federation: 1.22.0
  • files: 2.4.0
  • files_accesscontrol: 3.0.2
  • files_downloadlimit: 5.0.0-dev.0
  • files_external: 1.24.0
  • files_pdfviewer: 5.0.0-dev.0
  • files_reminders: 1.5.0
  • files_retention: 3.0.0
  • files_sharing: 1.24.1
  • files_trashbin: 1.22.0
  • files_versions: 1.25.0
  • firstrunwizard: 5.0.0-dev.0
  • forms: 5.2.3
  • groupfolders: 20.1.7
  • logreader: 5.0.0-dev.0
  • lookup_server_connector: 1.20.0
  • metadata: 0.23.0
  • nextcloud_announcements: 4.0.0-dev.0
  • notifications: 5.0.0-dev.0
  • oauth2: 1.20.0
  • ownershiptransfer: 1.3.0
  • password_policy: 4.0.0-dev.0
  • photos: 5.0.0-dev.1
  • polls: 8.6.2
  • privacy: 4.0.0-dev.0
  • profile: 1.1.0
  • provisioning_api: 1.22.0
  • quota_warning: 1.22.0
  • recommendations: 5.0.0-dev.0
  • related_resources: 3.0.0-dev.0
  • serverinfo: 4.0.0-dev.0
  • settings: 1.15.1
  • sharebymail: 1.22.0
  • support: 4.0.0-dev.0
  • survey_client: 4.0.0-dev.0
  • suspicious_login: 10.0.0-dev.0
  • systemtags: 1.22.0
  • tables: 1.0.2
  • text: 6.0.1
  • theming: 2.7.0
  • twofactor_backupcodes: 1.21.0
  • twofactor_nextcloud_notification: 6.0.0-dev.0
  • twofactor_totp: 14.0.0
  • updatenotification: 1.22.0
  • user_status: 1.12.0
  • viewer: 5.0.0-dev.0
  • weather_status: 1.12.0
  • webhook_listeners: 1.3.0
  • whiteboard: 1.5.0
  • workflowengine: 2.14.0
    Disabled:
  • customproperties: 2.0.4 (installed 2.0.4)
  • mail: 5.6.5 (installed 5.6.5)
  • richdocuments: 9.0.2 (installed 9.0.2)
  • user_ldap: 1.23.0

Regards, wm