I found the patch repaired bug in German version. I'm not sure if it's official patch.
In the meantime, I checked several versions, and only in English worked without problems. Unfortunately, only the English version is an older version of MM (poor graphics and one slot to save).
Apparently ScummVM corrected these errors, probably because it does not use the EXE file.
Anyway, I already have a corrected German version running on DOSBox.