Just wanted to add that I experienced a similar problem with 5.33.2.
I tried to delete a book and calibre just shut down. I thought it was the book, but I tried other books with the same result. Calibre just shut down. It does let me remove files from the book and even convert it, but not delete it even when it's an empty book. I ran Library Maintenance, and nothing came up or changed.
Since I had a backup of 5.32, I just restored the calibre files to the last version and I can now delete.
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