I have a connection on an 84 circuit panelboard that needed to be recircuited. It was circuits 73,75 (2pole breaker). I edited the electrical circuit to connect it to a new 42 circuit panelboard. The circuit keeps the same circuit number, as a result, you cannot 'see' this circuit because no such circuit number exists on the new panelboard.
Obviously the work around would be to either 1.) make the new panelboard an 84 circuit, more the circuit to an appropriate number, then change it back. or 2.) tell it to rebalance and it should bring it back down.
But we shouldn't have to do this. Revit should check if the current circuit is available and unused, if so it should keep the circuit. But if the circuit is not used, it should attach it to the next available circuit number.
Obviously small bug, but its something that might not be caught until its too late.