I override the animation track with an override track. The override track simply has one key frame for position at The Origin, nothing else is overriden in the track. And the animated character would collapse into the Pose in the Picture One when the clip is easing in or out. The pose is the same as the one when you edit the muscle setting of the avatar (pic2). I tried this in two diffrent projects with two different characters. I believe it’s a bug or something.
Timeline Version 1.8.7