Hey @christoph,
Thank you for reporting your findings. At this time I still cannot recreate the bug you’ve described and so I still suspect a deeper, site-specific issue as the culprit for your problems.
However, since you say you do not need Event Tickets and will deactivate it, I will close up this thread for now. Come back and open a new thread any time if other issues arise 🙂
Cheers!
George
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PS
Before closing, just to be clear, I will spend a bit more time trying to recreate this problem with Event Tickets and such. I just cannot see the problem now and there are no similar bug reports, but if we can recreate the issue we will make a bug ticket an will release a fix or it as soon as possible!