If you want help, don’t throw everything into the same bag and be comprehensive and precise in what
you post. Name the pre-upgrade version, show logs, describe how you migrated, how you access files and what you have done so far.
Least thing we expect is you reference the posts and issues you have opened.
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Cron is not known to stop working. I’d guess this is a symptom not a cause. If you have a rule triggered from cron but the rule has a bug and fails to execute, cron is not the reason.
Rules dealing with time written for OH2 often need to be reworked for OH3 due to Joda time changes
as you should be aware of if you have read the OH3 release notes.
There’s also not “the” known edit bug.
Debug your issues (enable karaf debug to see if rules start execution, add debug lines into your rules to see where they stop).
On your mapdb issue, delete all mapdb persistence files.
And finally yes since you deliberately chose to run in docker on a rpi that can cause issues for you that others do not have because they didn’t choose to install that weird combo.
So now your problem is that most users cannot follow or reproduce your issues because of your choice.
Granted, that’s just my $0.02 as the openHABian maintainer but still a valid point, but just for example openHABian deletes mapdb files on upgrade so running it would have avoided you run into this issue.