I have got problem with Bone Follower Component.
Spear after hitting collider (with Bone Follower Component) was attached as child to this collider [Bullet(Clone)].
Which looked like (5.0.1):
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After update to 5.1 or 5.1.1. it looks like this:
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Now spear is not moving with bone, but in different way. I have no idea where is the problem :/