When guardians aim at you they don't rotate around their center of mass they rotate around a point about a block above their hitbox. It looks very janky and in many cases makes it harder to hit them while fighting them.
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Thank you for your report!
We're tracking this issue in MC-119372, so this ticket is being resolved and linked as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
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does MC-119372 describe your issue? if no, could you give me a video for this issue?