[Bug]: App Order can not be changed reliable

⚠️ 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

Whenever I try to change the app order in the navigation bar settings they get moved back to the original position after reload.

Steps to reproduce

1. I changed my app order many months/years ago. The current oder looks like this:

2. When I want to change it, e.g. swap the two first apps in the menu, the request returns 200:
3. But if I reload nothing changed.
4. I can use "reset default app order", this works. After reload I have again the default order.

5. Now the really strange thing start to happen
6. I now want to change the app order based in the default order
7. I swap again the first and the second app, the request returns again 200
8. Sometimes it works sometimes not but latest if I continue to do additional changes, e.g. move the calendar from the back to the front within multiple steps or move more than one app and than reload strange things start to happens. Sometimes changes are simply not applied, sometimes other elements moved in parallel... for me it is completely unpredictable. If you just play a bit around you should be able to reproduce it hopefully.

Expected behavior

consistent and verifiable behavior if I move apps around.

Tested on c.nc.com (32.0.0 RC3)

Nextcloud Server version

32

Operating system

None

PHP engine version

None

Web server

None

Database engine version

None

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

None

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

No file, test, or entry point is named. Reproduce the app-order changes in the navigation settings, then trace the request and reload path; done means reordered apps persist consistently after reload without unrelated items moving.