The "original" is still available. How can I properly save the edited version?
P.S. The original works normally (i.e., the game recognizes and launches it).
I don't remember how I managed to save it like that...
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This happens if the name of the map archive (the file containing the map and created along with it) or the path to the map contains Russian or any other characters besides Latin letters.
h5m is that very archive.
Added 5 minutes ago
try saving it through an editor as... And rename it - remove the number and the digit.
Added 2 minutes ago
Don't touch the .h5m file.