P.S. Runs in normal version. But it works without modifiers on different floors. Therefore, map turns into something terrible due to the reset modifiers.
Very strange.
Map was originally created in an experimental version. And kept only in it. I tried to open a map from the experimental version in the normal one - it opened. But in the experimental - refuses to open.
Initially, it stopped opening in the experimental vesrion. In the usual opened in order to see if there will be the same error or not.
Nothing meaningful in the error log? I can't make it out myself.