Thanks for the links. It might be related to that bug. In my scripts I added another save() and then it works of course and as for the Admin Panel, until I have a solution I put a message into the help text that users have to click 'save and continue' first and then 'save' afterwards. Then it's fine as well. Phew at least the workaround was quickly implemented, still I spend at least 1 hour on figuring out what's going wrong.
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