Game Version: 1.20.1
Forge Version: 47.2.18
OptiFine Version: 1.20.1 HD U I6
Only Majrusz's Progressive Difficulty and Majrusz Library were added, without other mods.
Startup normally after delete OptiFine.
crash-2023-12-22_23.37.48-client.txt

Hello, thanks for the report, I fixed it with the latest 1.9.6 release