Mechanical Multiblock cannot form with generator block

[turabian-luvr]

(As discussed in the IE discord help channel on 25 Oct.)

Minecraft 1.12.2, latest IW version, IC2 not installed.

If there is a generator block along the shaft when I try to form the multiblock, the model appears for a split second, then breaks, deleting the generator block. Without the generator block, it forms as expected, just without any power I/O.

[Meserion]

Image would be helpful for those of us not on discord.

[ghost]

As in the other issue: "single phase generator" seems to be invalid.

[Chelidon]

I'm having the same problem. Maybe i'm doing something wrong? I put the generator block in the place of the shaft ( pic, right ) but when i use the hammer i hear a loud "clank!", it forms just for a second and then the gen. block dissapears. I've even copied some setups from google ( pic ) but it still doesn't form. Edit: I'm not using IC2