WeldContraint in Studio moves parts, inconsistently

When creating a WeldConstraint in the explorer and parenting it to a part then welding another part to that part, I get inconsistent behavior. Sometimes one of the parts moves to the other part and changes orientation, others times it does not.

Even more frustrating than that alone, the UNDO action does not undo the change to the parts CFrame, so everything has to be manually repositioned again.

I don’t remember being this frustrated before with WeldConstraints, has something changed? Isn’t the point of WeldConstraint to not move the parts being welded?

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this appears to be a bug, should i move this over to bug reports?