Hi @Eberhart, Paul ,
I have done a lot of research, and as I said before, this may be a random event, and I can't reproduce it, so there is currently no way to determine the specific cause of the problem, and more in-depth inspection may be required. I understand your feelings, but due to the limited forum permissions, in order to solve your problem faster and better, we recommend that you contact Microsoft directly.
The support team over there has the correct escalation channel, they can involve more resource and investigate the behavior from back end as fast as possible. They also can check the behavior on your end remotely. For reference: Get support - Microsoft 365 admin | Microsoft Docs.
Good day!
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