When I have a invisible Spider on my screen other random entities turn their opacity down and make me able to look through them as well as rendering the wrong side of the skin. (On the pictures it is just me but it also happens with other entities)
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That looks like MC-9553

It results into the same but has a different cause. In this one it only happens when the spider(or maybe something else) is on the screen

It's the same issue cause by sorting issues of the transparency