The exact conditions under which the bug occurs are unknown, but on rare occasions when the game is launched, the player's skin is not displayed correctly. Also, items in hand are not displayed correctly, especially bow, crossbow, trident, shield, and spyglass, which behave incorrectly when used.
Translated by DeepL
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I am unable to reproduce this. Are you using any add-ons/behavior packs? If so, please try disabling them to see whether that fixes it. Does this only occur in third person view?