This bug was already reported in:
This is NOT a duplicate of MC-55730 (which seems to have been fixed in one of the 1.8 releases). We created a new issue since the other ones are all closed as duplicates of this one.
Steps to reproduce:
Spawn a big (~50x50) stone platform using fill (you can build it by hand if you're brave enough)
There are bright spots below the platform
The reason for this issue (and a fix) can be found here: https://github.com/MinecraftForge/MinecraftForge/pull/3870
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marcono1234
PhiPro
The bug is still present in 18w07c.
PhiPro
This is fixed in 18w43a.
migrated
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