since 1.16.100 the first person animations bugged and until today in 1.18.31 this bug remains in the game, when you use skins from the skin creator the animations are normal, but when you use a custom skin the animations are buggy
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NOTE: I didn't use textures in the screenshot

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We're tracking this issue in MCPE-126660, so this ticket is being resolved and linked as a duplicate.
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