This one is bizarre. Here's the way to repro:
1) Place an MFE at face-level, exactly in front of you. Output dot should be facing you.
2) Dig one block down, so now the MFE is just above your head.
3) Crouch.
4) Wrench the underside of the MFE.
5) Observe that the output dot is on the top side, and if you connect power to the top side, the MFE does not charge.
6) Crouch and wrench the underside of the MFE again. See the MFE drop.
...
Repeat steps 1 and 2.
3) Do not crouch.
4) Wrench the underside of the MFE.
5) Observe the output dot goes on the bottom.
6) Wrench the bottom, the MFE drops.
6a) If you instead crouch and wrench, the output dot goes on the top.
6b) If you crouch and wrench, and the output dot goes on the top, you can either wrench the top *or* crouch+wrench the bottom to get it to drop.
This also repro's with the batbox.
