Nuclear bomb somehow disabled hostile mob spawning.

[MoodSwings0]

So, me and my friend were playing in the Nether, when we got the bright idea to detonate a nuclear bomb in the Nether to mine Ancient debris.

We exploded it, and get away, and when it exploded in the hours after, no mobs spawned, except for those existing in bastions, and any other structure with spawns.

Edit: Zombified piglins seem unaffected, too.