Yesterday I started a raid in creative mode by getting the bad omen effect and then went to a village. This particular village had no way of getting underground (caves, ditches, random holes) but when the first wave spawned in, they were underground. I knew this because I could not find them on the surface and when I passed by a mountain, I started hearing pillager noises. So I started digging until I found them, killed them all, and moved on to the second wave. Even though I was able to successfully defeat the raid and get hero of the village, I still think it is strange that all of wave 1 was underground. I was told that raids can start at random times and in random places, but this just did not seem right. Please let me know how they got underground and fix this problem please.