According to MC-276807, lower light levels making everything flicker should have been fixed in 24w39a. This is, however, not the case when using block light sources.
Steps to reproduce (a video is attached):
Go into an area with light level 0.
Place a torch.
Look closely at the ground.
❌ Everything flickers subtly.
Note that the part in MC-276807 that refers to everything flickering at night (skylight issue) no longer occurs, but the rest still does.
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So apparently this bug was not reintroduced, but actually never fixed. However, it is included in the scope of the fixed MC-276807 (there is also a video of the block light source bug attached to that report), and I also had a conversation with a developer in the report who seemed to deem this a bug. So the behavior is not new, but it should have been fixed according to MC-276807.
Can confirm, the flickering is very subtle and seems to be slightly more obvious when looking at it closely, and on light levels below 15-14.
Thank you for your report!
After consideration, the issue is being closed as Working as Intended.
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Are you certain that this behavior is new to the game? In what respect does it differ from MC-1843, which was introduced in Minecraft Beta 1.8?