In my world, I have villagers in two houses close to the world hub. Two times now, when a raid start, the mobs appear underground. I am convinced they spawn underground, because I blocked off the few entrances, and the land is quite flat, the only way they could've wandered into the cave is if they wandered in on the other side of the villager houses, about 100 blocks away, then walked through a big cave system, glitched through some walls, walked PAST the villager houses underground and another 50 blocks the other way.
In my world, I have villagers in two houses close to the world hub. Two times now, when a raid start, the mobs appear underground. I am convinced they spawn underground, because I blocked off the few entrances, and the land is quite flat, the only way they could've wandered into the cave is if they wandered in on the other side of the villager houses, about 100 blocks away, then walked through a big cave system, glitched through some walls, walked PAST the villager houses underground and another 50 blocks the other way.
It is really ruining the fun of doing a raid.