Withers are now able to have potions other than Instant Health and Instant Damage applied to them, as well as the Glowing effect from a Spectral Arrow.
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Can confirm it does not happen in 1.16.5
btw, did spectral arrows never have their own texture in bows?
I can confirm that this is an issue. Just for clarification reasons, this did not happen in 1.16.5.