When playing on a 1.15.2 server that has either single or double chests nearby at player, They are invisible until a right click is performed to force a rendering on them.

Additional note: They will become invisible again when out of sight and then coming back.

Which server?

play.mystiamc.com - 1.15.2 earth server, This is where it has been tested at.

(Use "/t spawn tokyo" to find unrendered chests if it occurs again)

Picture of invisible chest in case it didn't work the first time. (Occurs when loading different chunks from another place fully & use momentums)

Cannot reproduce

What mods do you have installed?

(Fabric-MoveChat is Chat Up!, Fabric-capes is just minecraftcapes from james and fabric-itemmodelfix is Item Model Fix)

Item Model Fix looks suspicious, let me check with that

https://www.curseforge.com/minecraft/mc-mods/item-model-fix - URL for it.

Ok it's not that. I'm not sure what it could be then, do you think you could find which mod it's incompatible with?

I will try to inspect one of the mods and see if one of them is compromised.

Tested so far:

MultiConnect only: Runs OK,
MultiConnect with Fabric-API: Runs OK,
MultiConnect with Sodium: Crashes client entirely when visiting 1.15.2 servers on 1.16.3 (Perhaps this is the culprit?, Mislead myself as the config was corrupt instead.),
MultiConnect with XLPackets: Runs OK,
MultiConnect with Phosphor: Runs OK,
MultiConnect with Lithium: Runs OK,
MultiConnect with BrandPacket: Runs OK,
MultiConnect with DeBrand: Runs OK,
MultiConnect with "Fabric-Capes": Runs OK,
MultiConnect with OK Zoomer: Runs OK.

Conclusion: I am likely that sodium is causing problems since all mods combined run sodium fine but chests may render invisible but with multiconnect & sodium only, game crashes entirely.

Is Sodium even updated to 1.16.3? O_o

https://github.com/FlashyReese/sodium-fabric/tree/1.16.2/dev - Sodium i used, But i don't think this is the perfect decision for "finalized" sodium. + This appears to be compatible with 1.16.3 but i cannot confirm this with other machines.

If needed, I also have an pre-baked modpack for this type of sodium via my own github profile in case if something seems odd.

I just installed that version of Sodium and it rendered fine.

Tried with the combined mods again and the issue is back. (This time i set a home to a random location then warped to it then instantly back to tokyo place as fast as possible and with random timings included)

(+ May be likely that this may also be caused by poor internet connections too)

https://streamable.com/5s41yl - Clip of me teleporting rapidly for issue to occur eventually.

If you can find a minimal combination of mods that it happens with that would be great.

^ Tried this test: Combining multiconnect with sodium and lithium as in minimal combination appear to cause this problem on my client-side. (Same commands used from clip)

Found the solution:

Lithium-0.5.5 (SNAPSHOT) with FlashyReese's Sodium caused the issue to occur, In short the lithium version had to be rolled back to 0.5.4 to avoid this problem, Meaning MultiConnect is not affected from this error.

In another comment: Issue has been re-directed to CaffeineMC/lithium-fabric#137