Dragon's hitboxes all out of place while he's turning (at least head+body, not sure with tail). Also he doesn't have hp bar in creative or in survival in overworld nor on peaceful, neither on any difficulty above peaceful, not sure about other dimensions, and I have a feeling that on a straight flight head hitbox kinda lower than it should be
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We're tracking this issue in MC-193356, so this ticket is being resolved and linked as a duplicate.
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