Non-boss mobs spawning in the boss arena - something to consider

I think hostile mobs MAY be able to spawn in the boss arena. Not sure if this should be considered a bug, but wanted to note this Currently I would say this is a small thing, but could become more important if the bosses are harder/dodging attacks matters next season. There is also the possibility of a mob knocking you back during the "freeze" period and missing the boss fight as a result. Currently, it appears that Zombified Piglins can spawn around (if not inside of) the boss arena, though this is due to the biome being set to Nether (before, I think overworld hostile mobs MAY have spawned in the boss arena)