I went through the code and figured it out:
it was a much more serious bug (unrelated to cheating and happens on all difficulties)
during the end of map sequence you could just keep clicking to skip levels
(damn, speedrunners would have loved this! 🤔
(it was related to an older bug with fading that got fixed.. and that fix caused it)
anyway, I added a new fix: ZortchHotfix_1723.zip
also thank you for finding it! 👍