How do I use PrepareMapChange/CommitMapChange?

Development World Creation
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6

Hi!
Same problem here. I do:
TArray* levels = new TArray < FName >;
levels->Add(“/Game/Maps/RoomNight”);
()->PrepareMapChange(*levels);
which seems to work (with a wrong path there is an error in log). But when I call ()->CommitMapChange(); the game freezes although IsMapChangeReady() is true.
Does anyone see my fault?