Just finished testing and this one is working!
You can consider this one solved.
However, if you need some more information on this, let me know.
Thank you for the support.
After editing two contacts in Nextcloud 13.0.2 hosted on a Debian derivative, I tried to sync back to my Android device running DAVdroid 1.11-ose downloaded from F-Droid. The result was that all contacts on the device (Samsung Note 3 running Android 5.x) were removed, even from all other accounts (Device, Google, Telegram, SIM, and Nextcloud). The data remains on the Nextcloud server.
Here is the debug log:
https://paste.fedoraproject.org/paste/~1iCvtiVQB~XZbjL-tZ-1g
I’m happy to help to reproduce the bug and triage solutions as need be.
Should be fixed with 1.11.1-ose. Can you confirm this?