I was testing out the snapshot and discovered a cave under a surface pond. When I dropped down there and placed a torch, the light levels failed to update. See screenshot.
The torch is also invisible.
The problem seems to correct itself after i remove the torch and place it down again.
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Confirmed. This is caused by the threaded rendering, will not occur in every case.

14w33c

This still happens occasionally when I place a torch in 14w33c

Still present in 1.8

happened to me as well in 1.8. randomly would fix itself with or w/o manipulation of torches. Sometimes even manipulation would not do anything.

I can't reproduce this in 1.8.2 pre 1.
I tried normal cave crawling and placing torches.
I tried flying around caves in creative mode and randomly placing torches.
I flew around at night over plains biomes and set torches on the ground
I went to the nether and tried the same things
I even changed my brightness setting from bright to moody and tried to reproduce it.
I changed my brightness setting back to bright and tried some more.
I can't think of anything else to try.

Has never happened to me in 1.9 snapshots. Cannot reproduce.

Is this still an issue in the current Minecraft Snapshot 15w47c or later? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases.

It happens to me in minecraft 1.9.2.

See MC-91136.