The game crashes after Joining the world... screen on Forge 1.20.1
There may be a compatibility problem with another mod, since, for example, after updating Embeddium to 0.3.20 everything was working fine.
Crash-report and latest.log

Here is a list of all the mods of my custom modpack that have been updated, and after what the problem appeared, if it helps narrow down the suspects:

• Alex's Mobs Interaction
• AzureLib
• BadOptimizations
• Bookshelf
• Elytra Slot
• [ETF] Entity Texture Features
• Forgotten Graves (via Sinytra Connector)
• Geckolib
• Just Enough Items
• My Nether's Delight
• Packet Fixer
• Polytone
• SeasonHUD
• Shoulder Surfing Reloaded

Nope, it's still here.

i think it may be entity texture features, i recently updated my mods and the only one we have in common is etf

This seems to be the same issue as ItsThosea/BadOptimizations#59

Hello,
It seems that the error was solved with update 2.1.3 of the BadOptimizations mod

i have to fix this too on my side

Yes, the BadOptimizations update did fix this.

fixed, thanks for the report