Calendar event disappears when changing calendar

[pailakapo]

User A has a calendar, and User B has a calendar. Inside User A's directory is a symlink to User B's calendar. Create / Delete a user B event is available to User A without a problem.

If a calendar event is created by either User on User B's calendar, then in iOS calendar app a user tries to change the "calendar" that it is saved to (change "calendar" from User B to User A), it disappears from the app. The event is not presented at all.

The filesystem still retains the event in User B's list of calendar .ics files, unchanged.

The expectation is (ideally) this event would be moved to the User A list of .ics files in the filesystem and presented normally on the app.
Or, at the very least, presented in the app unchanged (on User B's calendar) since this is what the filesystem actually shows.

[pbiering]

Is there a reverse proxy in front of resulting in not proper working MOVE request iOS is usually executing for item transfer?

See here for more details: https://github.com/Kozea/Radicale/wiki/Reverse-Proxy-Diagnostics-Troubleshooting#move-not-working

If this is not the case, please provide (obfuscated) sequence of Radicale (and in case in use reverse proxy) logs.