IC2 had the same bug a few months ago. It's much worse than 6x, since a full multiblock reactor has about 30 sides that you could pull energy from
Yeah it has 30 sides but only 6 Extra Connections to Reactor Casings. And Every Reactor casing (so max 6) outputs it energy. I will fix that anyways soon by installing the MultiStructure IC2 Exp API into the Nuke (which was anyways intended to be there).
But there is a couple new bugs fixed. XD A example. The recipe which is required for the Nuke is not aviable. I removed it at the time where i cleaned up the code... Its added again.
But comes only next release and for that i wait a day because there is more todo. Also my mod requires work and i did it laying around for a couple weeks now...
Also a cool thing is that IC2 Classic seems to be very stable even so that i use a very uncomplex code for the Energy Calculation.... It seems to be that IC2 Made a little mistake by that