All went well with the upgrade of my (new) phone from Android 9 to 10.
This time round, I didn't encounter anything weird (i.e. like having to re-enter my PIN) and sync continued to work after upgrad ...
Just to validate the above reports that there's a problem with Android 10. Google Pixel 1 user here. I sync over WiFi to fixed IP address phone on my LAN. First indication something was wrong was that ...
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