I don’t think you have ever investigated the tags on problematic images with a different program - or did I miss it? When I was using some very olde digikam version (4.x) I managed to **** up my tags pretty well, and digikam was even more confused than I was. I do think nowadays it is much more robust with regards to “weird” tags, but maybe it isn’t.
tldr: I propose to examine a problematic file for all its tags (e.g. with exiftool -a -G1, I think there is also an exiftool gui program for windows) and see whether there is something weird. If there is nothing obvious, do the same with a picture that works just fine and compare.
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