The nuclear bomb does not appear to be registered as an explosion.
Another mod in my pack uses explosions to transform enderite ore into cracked enderite ore when destroyed by an explosion,
(as shown this is code)
public void onDestroyedByExplosion(World world, BlockPos pos, Explosion explosion) { world.setBlockState(pos, EnderiteMod.CRACKED_ENDERITE_ORE.get().getDefaultState());

Here is a demo showing how the explosion data works for tnt and creepers but not for nukes:
https://streamable.com/rciwr5