deleted Entrys not showing after sync

[nbrgit]

Hey,
I've test the external Calender and made a mistake in my ICS-File.
So i've a duplicated Event in the Calender.

I've deleted the Events in HumHub and then clicked on Sync now. but the Event dosn't created again.
If i change the UID from this Event in my ics-File a new Event was created.

Now, I've delete my "Test"-Calendar and created new one with the same ICS-File-URL and no Events are shown in my HumHub Calender. Only if i Update the UID from 1-2024 to 1.2024

Any Ideas??