I'm using a heavily modded client (~120 loaded mods && ~80 mod files)

• When I use BruteForceRenderingCulling with Embeddium and I change my render distance, the game crashes
  This usually happens when I'm moving fast, like when I'm riding an ImmersiveAircraft plane.
  But it also happens sometimes out of thin air, while doing nothing or just changing video settings.

My forge version: 1.20.1-47.3.3
My main client mods: Embeddium, Embeddium++, Fastload, ImmediatelyFast, ModernFix, CullLessLeavesReforged, Saturn, FerriteCore
My main common mods: Create (and multiple addons), ImmersiveAircraft, ImmersiveEngineering

Problem: java.lang.IllegalStateException: Buffer mapping is already disposed

Crash report
Log File

I also have this issue. If you load too many chunks in a short period, you will get the crash "buffer mapping is already disposed"

I might have my own idea about what is going wrong for it to dispose lf the chunk map buffer twice
Maybe related to minecraft event firing twice because of, well... Events (they always act bizarre with Minecraft) or because of lag
Or it might be something else
I'll try debugging the source code to find it out and do a pull request later if I do find the cause, because I am not sur if the mod author is quick or not to resolve github issue posts
(The idea I actually get is either a shared buffer cleans twice, or l.559 of the culling state manager, the cleanup fires twice on the same object, since it only checks for null objects and not already cleaned objects (+ it could run at the same time making the check first and then making the check non valid only after both fired functions have passed)

This is a long message explaining what I think might be the problem, for the author to see in case I cannot free enough time to debug the mod's code

Oups, I pushed the wrong button and closed it by accident

Can confirm, this issue is bugging me as well. Seems to happen when I load too many chunks

Can be fixed by disabling Async Rebuild Chunk, but at a cost of frames.

I'm having the same issues, however my situation is similar yet different (I'm running a 350 mod fabric modpack) and I'm having the same causes for crashing like op's post ie changing render distance, just even loading the world for more than 5min crashes it giving the same buffer mapping is already disposed error I'm trying the disabiling async rebuild chunk option however my situation is different from op's and will reply if it helps with my issues, uploading my crashreport in hopes of helping
crash-2024-09-08_14.45.17-client.txt