How can I fix this union problem?

I tried making a hole with union but it made an invisible wedge on it, Is there a way to fix this? (Don’t mind my maid outfit)

Make sure that the CollisionFidelity is set to PreciseConvexDecomposition. If that’s not the problem, try setting CanCollide to false for some of the objects related to the hole.

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For the same reasons as other posts have stated: