Raid Omen can't trigger on pre-1.21 worlds

Whenever you try to trigger raid omen in worlds generated before 1.21 ,the effect does not appear and no raid starts.

Steps to Reproduce:

1. obtain bad omen
2. move close to a village and watch what happens

Expected result: Raid Omen is triggered and a raid begins 30 seconds later

Observed Result:Raid omen does not trigger and no raid is begun