Some areas of the nether are in the shade while they shouldnt, it happens with both smooth liighting and normal lighting.
Here is an obvious example : the lava is dark, but it should never be dark since produces light. It also happens on other places but it is less obvious.
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Ok i have seen that issue and i found a frozen lava stream only above one. most of these weirs shadows were random. Also, they sometimes vanish when i get close to them, and they always do when I fill a bucket with one of the dark lava blocks. Also, it doesnt only happen on lava. i will try to make a screenshot , but it's really hard. I saw it a couple times innether fortresses.
Most likely caused by MC-5568