They get double SU than they should. I'm using mohist(384) for 1.16.5 and forge .46. Having only 9 engines (with furnaces) produces 294912su (there is a water wheel on the contraption that's why there is a little more than 32k per engine).
Anyone with the same problem?

It has been tested on single player and the same contraption gives out 1.4 million SU.