For VRC constraints:

"Position At Rest" (under Constraint Settings) operates at a different (relative) scale from "Position Offset" (Under Sources under Element).

If the parent object's scale changes, the Position Offset is not compensated for. This is neither mentioned in docs nor expected behavior (and also very unobvious). I assume this is observable in-game as well, but it is at least observable in the editor.

SDK version 3.10.2