Player data does not include "LeftHanded" tag, which seems common to a lot of mobs. While maybe not considered originally, including this tag in player.dat would be fairly useful for maps/datapacks in order to account for players that set their main hand as left in their skin settings.
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We're tracking this issue in MC-165016, so this ticket is being resolved and linked as a duplicate.
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This ticket duplicates MC-165016