Hello.
When i input fuel into any fission reactor for the first time it will consume the fuel without giving a depleted fuel or power output, also if i insert a full stack it will be completely consumed in a sec and there will be no power/depleted fuel output.
redstone signal doesnt affect it, will happen when reactor is on or off.
this really makes automation difficult since i cant change the type of fuel that goes into the fission reactor unless i do it manually, if i just pipe a new type of fuel into a reactor it will just be consumed without any output until i place one manually and reactor updates.
ended up making a different reactor for each fuel type.
thx :)

I'm either unable to recreate this or I have misunderstood you - could you perhaps send some pictures or a video? Which version of the mod are you using? When you insert fuel for the first time, does the name of the fuel appear in the GUI?

i used 8 tbu fuel to show this bug.
i split them, first 4 i put inside just vanish, no depleted fuel and no energy, then i used the other 4 and they process just fine.
now i can pipe tbu into the reactor but if i try a different kind of fuel it will disappear unless i put one manually and let it disappear before piping in the rest.
best way to describe it is that the first fuel i put into the reactor sets the type and then i can pipe that type into the reactor.
i play on modern skyblock 3 latest version - 3.4.2
nc version is 2.11a

Ok, I may have tracked this down. Does this onlt happen after a reload? In other words, if you break and replace the controller, then put fuel in, it is still buggy, or does it work as expected?

the bug is gone now so i think the issue came from the pack and not from the mod itself.
the change i did was removing the stages script from the pack because of another issue i had with it, we were at the end anyway so all stages were supposed to be unlocked but for some reason we had many bugs with staged items, and in a test world everything worked fine so we figured the bug was with our world only.
i was past the nuclearcraft stage so i didn't know it fixed it until u replied and i checked.
thanx for your help