When I was playing on my server, I saw that a pillager patrol had spawned, and I went to kill them. I went to the pillager with the banner.
I saw that the banner's texture was bugged (screenshots 1, 2, and 3).
Then I created a world with creative game mode and tried to see this bug. At first, I couldn't, so I decided to repeat the items from the hotbar and found out that the texture of the banner in the second hand is bugged when I have any blocks in the main hand(screenshot 4).
I still haven't figured out how to make the banner bugged on the pillager's head
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We're tracking this issue in MC-302669, so this ticket is being resolved and linked as a duplicate.
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