Hi,
Gsync used to work on lineageos-microg-pioneer.
I found just now that it stopped a while ago (june '22) both for calendar and contacts.
It doesn't return any error.

After a while looking for the point I only found out that magisk version updated from v.22 to v.25 (as far as I remember I did it when LineageOS updated to 19.1).

May that be the point?