Power circuit suddenly splits

When my power suddenly stopped working I was able to track the issue to this plate.

For some reason a connection that worked for a hundred of cycles suddenly stopped existing. When I built a new plate so it did not crossed other plates, the connection worked. Can't be sure if something was broken or fixed, but if fixed, the the plates should not be able to be built this way if they don't connect the power.

Not sure if related, but the circuit split sometime after building following at the and of the line:

Dystopia.sav