Created a pathfinding bot, worked perfectly! Until, I decided to include Union parts in my place. The script does not error, however pathfinding seems to dislike Unions, my bot was unable to generate a path from one side of a union part to the other, it’s easy to repro. Just make a union part and then attempt to pathfind around it. The path will never be returned, it will just continue to attempt to generate the path.
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Lets hope this fix comes with physics 
I think that might be due to the bounding box size of the Union. Because collisions haven’t been implemented for Union parts, the whole Union piece (basically a large cuboid/box) is seen as essentially a large brick part. Therefore, any pathfinder will avoid the whole bounding box of the union piece.
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The issue is that it can not calculate a path round a Union Part, sorry if that wasn’t clear. The method seems to yield when it reaches a union part.
Hmmm, yeah I have a repro. This is definitely not intended behavior. Good find.