Netherrack can generate fully encased in bedrock preventing the player from destroying it

While not technically a bug, it is surely a game-breaking unintended issue. This is a problem because it prevents using a beacon there. Beacon beams can go through bedrock but not netherrack, and the random spotty unnecessary bedrock generation of the bedrock roof (and ground) sometimes make a block get encased in bedrock. I tried breaking it with explosions but to no avail.