Chapter 10: Challenge - seesaw joint by code

I ran into the same thing and after a bit of searching on the forum, found the same question for an older version of the book:

which pointed to an older errata thread:

Though as someone in the question thread pointed out, it is interesting that enabling Pinning with a Collision Mask of 11 works, while the programatic route requires a Collision Mask that excludes PhysicsCategory.Edge.

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