WeldConstraints only working once detaching and reattaching in playtest

I’ve got a complex issue,

image
This weldconstraint is connected properly.

When testing the game, even when the Part1 is unanchored, it is frozen in place.

Once I for example change Part0 and Part1 to be the same and then put it back to where it was supposed to be, it finally would work.

Any help on this?