When you try to load your reactors with 1 fuel cell at a time, it will not output the used one, before there is a new one inserted. This means you cant use the event "depleted fuelcell removed" to load a new cell because it wont output it until the new one is in.
Please fix it or give us uncausal controllers
![Laughing :lol:](./images/smilies/icon_lol.gif)