I've been playing this world for awhile and have not seen a raid the entire time.
I've had a "village" for at least 200 mc days
Cats and Iron golems spawn in my village but there hasn't been a single raid and I haven't ran into any pillagers.
Compared to a regular generated world where you'd sometimes happen across pillagers.
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@Neko
If I trigger it with commands yes you get a raid, however they don't spawn within bell range. They spawn inside caves and are unreachable/findable unless you kill them with commands. Comparing to a default world type living next to a village (or making your own) you would get visited by parties of pillagers every few Minecraft days. Which usually initiate raids when you fight them. I haven't seen a single pillager compared to the large number you get on a default world.

Can confirm in 1.17-pre5.

From what it sounds like in the description, it seems like you are waiting for a pillager patrol, not a raid
Raids happen when you go inside villages with the bad omen effect, and there are a lot more illagers.
Currently blocked by MC-236647.
Raids only occur when you have bad omen. Does having bad omen while in the village trigger a raid?