[Bug]: A lot of app config keys are not defined

⚠️ This issue respects the following points: ⚠️

• This is a bug, not a question or a configuration/webserver/proxy issue.
• This issue is not already reported on Github OR Nextcloud Community Forum (I've searched it).
• Nextcloud Server is up to date. See Maintenance and Release Schedule for supported versions.
• I agree to follow Nextcloud's Code of Conduct.

Bug description

After upgrading from 32.0.11 to 33.0.5 I am flood with a lot of warnings about not defined app config keys for DAV.

Steps to reproduce

The notifications:

[no app in context] Info: The app config key dav/hide_absence_settings is not defined in the config lexicon
	GET /index.php/settings/admin/logging

[no app in context] Info: The app config key dav/sendInvitations is not defined in the config lexicon
	REPORT /remote.php/dav/addressbooks/users/admin/contacts/

[no app in context] Info: The app config key dav/enableCalendarFederation is not defined in the config lexicon
	REPORT /remote.php/dav/addressbooks/users/admin/contacts/

[no app in context] Info: The app config key dav/allow_calendar_link_subscriptions is not defined in the config lexicon
	PROPFIND /remote.php/dav/principals/users/admin/

Expected behavior

In my opinion these warnings should not appear.

Nextcloud Server version

33

Operating system

Debian/Ubuntu

PHP engine version

PHP 8.3

Web server

Apache (supported)

Database engine version

MariaDB

Is this bug present after an update or on a fresh install?

Upgraded to a MAJOR version (ex. 31 to 32)

Are you using the Nextcloud Server Encryption module?

None

What user-backends are you using?

• Default user-backend (database)
• LDAP/ Active Directory
• SSO - SAML
• Other

Configuration report

List of activated Apps

Nextcloud Signing status

Nextcloud Logs

Additional info

No response

Start by inspecting the DAV app's config lexicon declarations and the usages of hide_absence_settings, sendInvitations, enableCalendarFederation, and allow_calendar_link_subscriptions. Reproduce the upgrade-related warnings and verify that each reported key is defined in the lexicon and no longer logged as undefined.