Hmm, I see where the problem is coming from, your custom columns #mm_annotations are technically malformed, wich is very strange because it should never happen.
So, how was this column created? By another plugin? Or is it a very old library and herefore a very old columns? And how does it render in Calibre? Plain text or HTML?
In any case, I add here a test version with a fix, please can you confirm that it work now? thanks.
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