In patrols, the all pillagers either don't spawn or despawn usually leaving one or two vindicators just wandering around, usually without a banner, making it hard to get bad omen from patrols. To reproduce go around a world and you can find random vindicators around, sometimes with banners, but with no other pillagers around.
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duplicates
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GoldenHelmet
migrated
Thank you for your report!
We're tracking this issue in MCPE-75470, so this ticket is being resolved and linked as a duplicate.
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