i once got a ClassCastException crash caused by casting a TileEntityReactorFuelRod to a TileEntityReactorControlRod. i havent experimented but its pretty obvious it happens if someone places a fuel rod where a control rod is meant to be, and somehow passed the checks saying the block was accepted, because ive placed all sorts of block in those locations by mistake sometimes but it never crashed.
so checking if the tileentity is a control rod should hopefully fix that rare crash.
i once got a ClassCastException crash caused by casting a TileEntityReactorFuelRod to a TileEntityReactorControlRod. i havent experimented but its pretty obvious it happens if someone places a fuel rod where a control rod is meant to be, and somehow passed the checks saying the block was accepted, because ive placed all sorts of block in those locations by mistake sometimes but it never crashed. so checking if the tileentity is a control rod should hopefully fix that rare crash.
the crash report if you want to read: https://pastebin.com/D81r33Fy