The issue does not occur anymore after updating to DAVdroid 0.9.0.4.
Good to know, thanks for the information 👍
I use /e/OS Android system, a fork of LineageOS, and OpenTasks is installed by default but as a fork, named simply “Tasks”. For this reason, I can’t install real OpenTasks.
The issue is that, although I installed DAVx⁵ after Tasks (as it comes into the ROM), I don’t manage how to sync it to DAVx⁵.