I Made A Parkour Course With Slime Blocks But Every Time I Reopen The World, The Slime Blocks Lighting Goes Funny
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Please force a crash by pressing F3 + C for 10 seconds while in-game and attach the crash report ([minecraft/crash-reports/crash-<DATE>-client.txt|http://hopper.minecraft.net/help/finding-minecraft-data-folder]
) here.

Here's The Crash Report

I Also Found That Ice Has This Problem

I'm experiencing the same issue. I see it with slime blocks, with ice, and also with underwater glass blocks.
If I place a block (any block) near the affected area, the lighting fixes itself. But then if I fly away from that area (but not very far...all of the chunks are still loaded and visible), and then fly back, the problem often reoccurs.

Relates to or duplicates MC-38022
Confirmed for
15w45a You can see it the most when using third person view