Very nice work! It seems you are right. Pastebin is to blame here. Maybe it converts binary text to unicode, making Python read it incorrectly when loading it. The easiest solution here of course, would be to use another service to share maps.
Do you have any suggestions for such a service? Unfortunately, Itch doesn't allow uploading files.
Perhaps pasting it here as code will work. (doesn't seem to work either)
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If a good alternative is not found, I should be able to fix the issue in code, though it would be nice to avoid it ;-)