See summary. Additionally, this does not spawn a pillager raid.

How to reproduce:

1. Enter a village.
2. Go into spectator mode using /gamemode 3 or by pressing F3 + N.
3. Give yourself the Bad Omen effect using /effect give @s bad_omen

          → Notice the particles appearing, signifying you've supposedly triggered a major pillager raid by walking into the village

The screenshot below shows the particles generated from the Bad Omen effect being removed.