Casper V.
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I killed 3 patrols it gave me 3 Ominous Banners in total and they could be stacked.
It doesn't show the patterns until you place the banner, but then you can't stack that banner with the other 2 which haven't been placed. If you place these down, you can stack the 3 banners again.
I also have this problem with my iron farm, my waterstream is 3 blocks wide
My temporary fix is by placing signs on the walls, so only the middle one can be used for spawning, the Iron Golem needs 2 block of space so it won't suffocate in the signs 😉