Visiting Pillagers can spawn their top half into leaf blocks; that or their spawning teammates push them into such a position when spawned togther.
I am using a non moded version of java in hard mode without commands; just the standard vinalla gameplay.
I was at in at a river in a savanna; the pillagers spawned in a forest just on the other side of the river.
this happend in both 1.21.5 pre-release 2 and then again in 1.21.5 pre-release 3. the first did not have a banner, the second did.
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