TomOrr0W
Assigned
Reported
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I must have missed the original request last year to check if the issue is still occurring.
It is indeed no longer occurring in the world I took my screenshots from. However, I have not expanded the building there to reach the new build height limit (the top is still at y 255). I do have other structures that reach the modern build limit, but the blocks at the top of them are transparent - I haven't seen any lighting issues around them either.
I also noticed this behavior in my world after upgrading from 1.17.1 to the 1.18 release. Passive mobs in newly generated chunks that are subject to blending (i.e. near 0,0) and in deleted terrain traveled to via Nether portal seem to generate according to a different terrain configuration and then fall onto the actual terrain (be it water or land). Once I go a significant distance away from 1.17.1 chunks, mob generation in new chunks returns to normal.
Note that I deleted chunks that weren't being actively used using NBT explorer and/or deleting region files before upgrading. The linked backup is from right before the 1.18 upgrade. Also note that I ran "Optimize World" with Erase Cached Data checked before opening in 1.18. I used the following view distance settings: Render Distance: 20 chunks; Simulation Distance: 12 chunks; Entity Distance: 500%
https://drive.google.com/file/d/1MiJmn2ox4Y5Vt54P4I50y4AZJr00FjEq/view?usp=sharing
The screenshot below is an example of the issue. There is a Nether portal nearby that leads to a network of portals, some of which had the other side of the portal deleted and others which kept a few overworld chunks around the portal exit. I saw this kind of behavior in both cases.
[media]Never mind on the comments mentioning sunset in the previous message. I reran optimize world and then went into/out of the Nether again during early afternoon and got another lighting glitch (slightly larger than the first one and much smaller than the second one) in Area 2 from the previous message.
I experienced something similar to this in 1.16.3: I have an enclosed bubble column that goes up to build height and there are spots to the South and sometimes East that have low sky light despite nothing being above them. Going up to build height does not change the light levels at ground level (y=62).
The issue goes away if I use Optimize World (and erase cached data), however, I can bring it back fairly easily by going into the Nether (unloading the area) during sunset. Returning from the Nether during full daytime doesn't seem to change sky light levels at all; I didn't check returning from the Nether during full night. I can probably put a copy of my world save on my google drive and link it if that is requested.
In the screenshots I attached, I had two areas with these lighting glitches before optimizing the world. The glitches appeared after a fall damage death (near one of the water columns) unloaded the area. The torches were placed in areas where the sky light level is 7.
Area 1 before optimize world is the area to the East (two blocks at sky light level 7).
Area 2 before optimize world is the area to the South (several blocks at sky light level 7).
Area 2 after optimize world is just showing the sky light level being restored to 15 (this happened for area 1 also).
Waiting for Chunk is just noting that immediately after Optimize World or returning from the Nether, the light levels are replaced with that text until you move around.
Area 2 after going to Nether is a new (larger) area of low sky light (in about the same location as Area 2) after returning from the Nether during sunset. Area 1 stayed at sky light level 15 this time.
Here is a twitch clip that appears to match this report:
Looking back at this, I had only deleted chunk data itself in my previous comment - not POI data or entity data. That was almost certainly the cause of what I mentioned in my comment - so nothing useful for Mojang there. I have not seen similar behavior in subsequent upgrades/trims where I deleted the chunk, POI, and entity data in sync.
My world hasn't been in any snapshot versions since maybe single digit full release versions or beta 1.7/1.8, so I can't answer the question by Jiingy - that would have to be up to Alejandro.