Thanks for the additional info. This is an interesting edge case!
I did think inspect element would do the trick. Try to edit the tickets manually in the database instead: Use phpMyAdmin or Mariadb command line, navigate to the tickets table, locate the ticket via its ID, adjust the ticket details field to not include the image.
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For a long term fix: If you are able to reproduce this on the demo and link the ticket ID, we might be able to look into it further.