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why become the cubes not connected with the function join sides with a new cube any more?
2 cube to add whit malfunktion join side
I need a more detailled description of what you are trying to do here. Please attach a zip/rar/7zip file with the level and tell me what sides of which cubes you are trying to connect.
Found a bug with join sides that looks like it might cause this - found a fix, can check it in on my next submission...