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
is duplicated by 4
Attachments
Comments 15


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 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.