When there is a shulker nearby the shulker boxes play the shulker open annimation, if you place a shulker box next to a shulker you cant open the shulkerbox see Attachment
Edit: When you kill the shulker when open the shulkerboxes will get stuck at the open posision Same for the animation in the creative and survival menu
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We're tracking this issue in MC-203562, so this ticket is being resolved and linked as a duplicate.
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