It appears that on Alex model skins, the left hand item renders outside the arm. This is not the case for Steve model skins; as it seems that the Alex model skins are actually rendering left-hand items as if they were Steve model skins.
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Check under [Options] > [Skin Costumisation...] if the main hand is set properly.

Duplicate of / relates to MC-72397

All items seem to be rendering as if the left hand was on a Steve model skin.