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When B mirrors to C, PIDs already negative from A get re-transformed: -((-7) + 2) = 5, which restores the original PID and collides with local producers on C.

Code Block
  A           B           C           D
-1 -------> -1 -------> -1 -------> -1
 5 -------> -7 --------> 5 -------> -7              
                         5 -------> -7 # collision

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