@1001Musik Jochen, I think that this response of yours may have been posted in the wrong forum topic:
Perhaps one of the mods can move it (paging @dh024 or @bw-admin for help with this).
Your experience is definitely not typical, which is why I was attempting to see if a cause for the problem could be identified. If it is a bug in Bitwarden, and if it can be reproduced by others, then it should be reported on GitHub. Actually, there are a few issues similar to yours already reported there (Issue #1339; Issue #1388). There is also a general discussion of autofill problems in the mobile apps in Issue #1389, in which Bitwarden provides a form for reporting problems with specific websites, so that they can track the issue and work on strategies for fixing these problems.