Now who was the genius, who thought that allowing RP tube to input fuel to the collector conversion output slot is a good idea...
Tubes should be allowed to input stuff only to the 16 left queue slots and pulling stuff out from collector should happen only from the 16 slots and the conversion output slot
But at this point, if the collector output slot is empty and queue slots are full, next incoming fuel packet will go to conversion output slot and thus stoping the conversion