accepting an event invitation too slow, leads to errors

Steps to reproduce

1. in full screen event view of an event invite, click accept (possibly 5 or more attendees are needed to reproduce)
2. nothing happens, no loading spinner. Am I supposed to close the editor?
3. close the editor via x button
4. Error "updating invitation failed"
5. Then it turns out that accepting actually worked, event color changes to accepted state

Expected behavior

click accept, event editor closes automatically, event color switches to accepted state

closing an event during background processes should not result in errors

Actual behavior

see "to reproduce"

Calendar app version

6.2.2

CalDAV-clients used

Browser

Firefox 149.0.2

Client operating system

Linux Mint 22.3

Server operating system

No response

Web server

None

Database engine version

None

PHP engine version

None

Nextcloud version

33.0.2

Updated from an older installed version or fresh install

None

List of activated apps

Nextcloud configuration

Web server error log

Log file

Browser log

Additional info

No response

Start with the full-screen event invitation view and its Accept action, reproducing with five or more attendees in Firefox. Trace the delayed update and editor-close path; done when accepting closes automatically, changes the event color, and closing during the background update does not report an error.