Issue description:

Game crashes when loading a world intermittently.
Restarting the game and trying again will eventually let me in.

I'm guessing it's due to Optifine because it seems to be fine without it.

Version (make sure you are on the latest version before reporting):

• Minecraft: 1.15.2
• Forge: 31.1.77
• Refined Storage: 1.8.3
• Optifine: HD_U_G1_pre16

Does this issue occur on a server? [untested]

If a (crash)log is relevant for this issue, link it here:

https://gist.github.com/DuelMonster/91ca0f4be221762c7ac3c8e3ece8eb16

I would wager this is caused by optifine. There haven't been any reports of this before.

Please report this to Optifine