I found quite an interesting bug.
I first thought that the Batbox, MFE and MFSU now output on other sides aswell instead of just the output side.
I tried it with all 3, I place them down, charge them up, place a machine directly next to it (not on the output side ofcourse) and wire them together.
I then run the machine, and cut the cable after a minute, but the machine keeps drawing EU from them, even without the cable connection.
But then I tried placing a machine 2 blocks away from them, do the same, and cut the cable. but the machine keeps running.
So it seems that the cable I broke somehow stayed behind, and keep supplying the machines with EU.
I tried putting a block at the machine at where the wire was, but the machine kept going
I also left it processing a stack of items, but the machines just didn't stop.
I even broke the Batbox, MFE and MFSU, which stopped the machines.
but when I put them back in the same place and refilled them, the machines started working again