Should be fixed in 0.0.5.
Problem seem to be due to mod using entity which has no corresponding placeable item, which can't be used as a signal here.
Fixed by adding "O" signal (stands for "others") which represents a sum of all such unconventional not-on-map power-producing entities from mods.
There's no good way to tell them apart on the circuit network, as there're no corresponding signals, beyond assigning random letters to each maybe, which I suspect will be more confusing than useful, as hopefully they're rare enough and people don't need to tell stuff apart often anyway.
Tested with bio-farm building from this mod, seem to work, but do let me know if there might be any issues.