Integrity check / carddav / after update from 20.0.2 to 20.0.11

Nextcloud version : 20.0.11
Operating system and version: Debian 10
Apache: 2.4.38
PHP version: 7.3

I made an update from Nextcloud 20.0.2 to 20.0.11.

After I fixed the reported db issues (db indices, big int) manually I got an integrity check error for the file .well-known/carddav. This file was fine with 20.0.2 and has not changed. The other file for caldav, which is identical, was not complained.

The output of list of files which “failed”:

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

- core
		- .well-known/carddav

Raw output
    [core] => Array
            [EXTRA_FILE] => Array
                    [.well-known/carddav] => Array
                            [expected] => 
                            [current] => 545da3862e3d3a24e5bc9c4f37fbe10c5b85b2afb011efcb93278ae6e22a3233a8578f6d84849277b9f510728957de882879dde523cfd04b69b2fb59615684d9




I checked the forum and searched for this. I see a lot integrity checks.
I checked the documentation but the examples do not cover my issue here.

Where are these hashes stored?

Why is only carddav complained and not caldav?