So... Been playing minecraft snapshot 21w07a, just exploring a grimstone cave when i found a mineshaft with lights.
Was searching for the source of the light there was nothing, no torches.
I left the world then rejoind the light was gone.
It's a weird glitch and it might affect in the experience, that's why i'm sharing it.
1.16.5
Seed: 7437479687689956085
/execute in minecraft:overworld run tp @s -129.38 35.00 877.42 89.55 -11.55
21w08b
Seed: -1601601017667666262
/execute in minecraft:overworld run tp @s -327.54 -31.00 289.77 -1080.91 6.90
Video:
[media]Linked issues
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I was able to reproduce this in both 1.16.5 and 21w08b. It appears to be a client-server desync of the lighting. I suspect that the client thinks a torch generated in that position and the server knows that the torch did not generate there. This bug is relatively common.
1.16.5
Seed: 7437479687689956085
/execute in minecraft:overworld run tp @s -129.38 35.00 877.42 89.55 -11.55
21w08b
Seed: -1601601017667666262
/execute in minecraft:overworld run tp @s -327.54 -31.00 289.77 -1080.91 6.90
Video:
[media]
Can confirm in 21w11a. This can be seen quite often.
Can confirm in 21w13a.
Can confirm in 21w16a.
Can confirm in 1.17-pre5.

Can confirm in 1.17.

Can confirm in 1.17.1 Pre-release 2.

Can confirm in 1.17.1 Release Candidate 1.

Can confirm in 21w37a.

Can Confirm In 21w39a

Can confirm in 21w40a

Can confirm in 21w41a.

Can confirm in 21w42a
[media]
Can confirm in 21w43a.
I Tried To Attach Screenshots But It Doesn't Work.