Following the fix for MC-276674, specially rendered elements on entities such as spiders, endermen, and phantoms no longer render using additive blending, making their eyes appear completely opaque while invisible as opposed to having a "glowing" effect on objects behind them.
24w39a:
[media]24w38a:
[media]In the following screenshots, you can also see that the objects behind the enderman's eyes are faintly visible in 24w38a, however they are not in 24w39a:
24w38a:
[media]24w39a:
[media]Linked issues
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Blocks MC-235953; even though it may seem like that issue is fixed, it is only because there is no longer any blending at all