How did you move the book? I tried it with "Copy to library" and get a duplicate book warning. If I accept the duplicate, I get two copies in the receiving library...the old one does not have the change, the new one does.
Normally, if you change metadata, you have to run Polish or Embed metadata to actually write the changes to the book file. If you used your file manager or some other method to move the book, possibly the book itself did not have the change and this is why the new comment did not show up.
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