Hi olev,
The problem is not escape sequences, so you do not need to test with a split music library.
I tested the files (unchanged) on my Pi 3B with the latest build and got exactly the same results as you.
Then I used MP3TAG to open the files and then save them. This is the way to use MP3TAG to correct possibly damaged tags. I tried again and everything is OK. So the problem seems to be related to incorrect, damaged or broken tags.
So install MP3TAG and try it yourself

See this post for a MP3TAG download link:
#47541
You can find information on internet to explain how MP3TAG can be used in batch scripts, this may help automating the fix, but I don’t know how to do it. Otherwise you will need to open the damaged files directory by directory. MP3TAG can be included in the context menu in windows, this is really handy. If you are successful in making a batch file to correct a complete library please post it on the forum.
Janui
PS For copyright reasons please delete the download link containing the test files from the previous post. My test copy has already been deleted.