Cannot synchronize CalDav after upgrade to 5.0.2

Hi!
After upgrading from 4.4 → 5.0.2, I noticed that the Outlook clients that use CalDavSynchronizer (we are using version 4.4.1.0) do not work anymore. It’s not sync’ing in neither direction. I’m using OpenXchange on the server side as a web based client.
When I push the Sync Now button, I can get the following messages:

10.1.1.60 - - [05/Aug/2024:00:10:15 -0300] “REPORT /caldav/Y2FsOi8vMC8yNTk5/ HTTP/1.1” 207 1738 “-” “CalDavSynchronizer/4.4”

I already checked if CalDavSynchronizer is declared on the ox/caldav/useragent/whitelist registry entry, and it is. Don’t know if there is any trick to make this work again.
IMPORTANT: It works like a charm when using the native Thunderbird CalDav option of its Calendar feature.

This only happens with the Calendar feature of Outlook, because creating tasks works like a charm in both directions.

Thanks in advance, and best regards!

HeCSa.

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