Lightning bolts still create fire when striking a lightning rod, which is very unintuitive and pretty much defeats the purpose of the blocks. If an unknowing player places a lighning rod on their wooden roof to stop lightning from burning it down, it will cause the opposite effect, guiding the lightning to their roof and setting it on fire. The block was first introduced with the example of protecting wool roofs and it doesm't do that.  Fire shouldn't generate when a lightning bolt strikes a rod.