Yes, definitely
Was the sync working for some time with Google account before it started to fail?
I think so but I can’t be 100% sure.
Have you tried to remove and add the Google account to see if that has any impact?
I had disabled it before, that didn’t help.
Now I removed it completely, then uninstalled Microsoft Exchange support (I know it has nothing to do with Google, just something unneeded I remembered - there are no longer Exchange accounts on my phone).
After a reboot all is good.
Re-adding the account and rebooting again => back to the problem as described in OP.
The other person having problems with messageserver5 said something about Wlan vs. Mobile Broadband iirc, so I tried enabling mobile bradband, disabling wlan, and rebooting. This does not seem to have any effect on my problem.
On my desktop I use evolution to access the same account. It doesn’t have 2FA enabled, and constantly asks me to confirm new logins from different devices, and re-enter my password. I don’t want it to ping my phone each time I log in. I think I’ll just set it to forward all incoming mail to a different account & fuck Google.