The bug
Occasionally, when breaking a block, the block entity will flash before returning to normal lighting. This only seems to occur when the rendered light is low enough, but is not affected by the actual light level.
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This issue is happening to me as well (1.15.2) everytime I play and mine. It is quite irritating so I am switching back my world to 1.14.4.
Microsoft Windows 10 Home Version 10.0.17134
System Model HP 250 G6 Notebook PC
System Type x64-based PC
Processor Intel(R) Core(TM) i7-7500U CPU @ 2.70GHz, 2901 Mhz, 2 Core(s), 4 Logical Processor(s)
Installed Physical Memory (RAM) 8.00 GB
Minecraft settings:
fullscreen
biome blend 3x3
graphic fancy
smooth lighting maximum
Vsync ON
Britghness: Moody
Mimap Level 3
Render distance 10 chunks
Max framerate Unlimited
Clouds Fancy
Particle All
I changed the settings, the bug is still here.
I am sorry I cannot provide screenshots. Weirdly, it doesn't seem to appear on them.

I just found a let’s play where issue is visible at 8:22
https://youtu.be/k5is_BxdraE
I got this yesterday as well (vanilla 1.15.2).
Should be fairly simple to reproduce, just dig in a dark area and look at the block drops.
Edit: Also, @unknown confirmed this issue, so maybe ask him if you have trouble reproducing.

Can confirm for latest snapshot being 20w13b

Can confirm for 20w18a

Happens to me aswell, also on a notebook with a integrated graphic and NVIDIA graphic

Can confirm for 19a

Hi it is me again. So I bought a new laptop (Dell G3 3590) with way better specs than the one I used before, and unfortunately the problem persists. I confirm for latest snapshot 20w21a.
To see the issue, dig in survival in total darkness to the deep underground.
I couldn't capture the issue in the screenshot, but here are my specs:
[media]Best wishes,

Thank you for your report!
We're tracking this issue in MC-167359, so this ticket is being resolved and linked as a duplicate.
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