I have tried reloading the save/game, I have tried taking out the ion cube and putting it back in, i even tried sending the proto away then warping it back with the terminal, it always results in 1 of the 2 default power bricks being permanently "dead"
Taking it out and re-inserting merely makes the second brick the inaccessible one, and it's not a case of just 1 cube being invisible, oh no, its "occupied" but it doesn't generate power as there isnt even a cube in there. It counts it as max capacity and everything!
As always, provided screenshot of the issue + logoutput file