Game crashes on old save ConcurrentModificationException

[riperat]

Bug Description

After a Windows disk clone to a new disk after I tried to start my save it crashed. Minecraft and all game data are not on the cloned disk. No crash on a new world

Did this behavior use to work in the previous version?

no

Steps to Reproduce (for bugs)

Run sevtech ages save

Logs

• Crash Log: https://pastebin.com/EVuue0ac

Client Information

• Modpack Version: 3.2.3
• Java Version: 11.0.16.1
• Launcher Used:TLauncher
• Memory Allocated: 8000MB
• Server/LAN/Single Player: sp
• Optifine Installed: Yes
• Shaders Enabled: No

World Information

• Modpack Version world created in: nan
• Additional Content Installed: No