Raids waves can spawn inside villages when forced to. To reproduce, place a villager and a bed on a completely isolated platform, give yourself the bad omen effect, and see the raid spawn on the platform. Since this didn't happen when raids were introduced in 1.14 snapshots, it's a bug.
MC-187758
Raids waves can spawn inside villages when forced to
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Mob spawning, Raids
1.15.2, 1.16 Pre-release 2, 1.16 Pre-release 7, 1.16 Release Candidate 1, 1.16, , 1.21.1, 24w36a, 1.21.3, 1.21.4, 1.21.10
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Can confirm in 20w49a. To reproduce this issue, simply create a superflat world using the present, "The Void". Narrow the area down to 5x5 blocks and place a villager along with a bed. Give yourself the bad omen effect and you'll notice that the raid spawns within the "village". Commands to help reproduce: