I've been noticing an issue with Wandering Traders behaving in a similar manner to Witches where they turn invisible and emit dark greenish grey potion particles.
The Llamas are unaffected by this issue and the leads form a V shape with the pointy end of the V in the spot where the trader should be.
This started appearing in the final Hotfix Update for 1.19 and has since carried over into 1.20
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We're tracking this issue in MCPE-42501, so this ticket is being resolved and linked as a duplicate.
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