World not loading / Update to 1.20.5/6

[500-internal-server-error]

Describe the bug
The game launches in 1.20.6, but cannot load worlds.

To Reproduce
Steps to reproduce the behavior:

1. Install 1.20.6 + this mod (1.4.14-1.20.4)
2. Create a new world
3. See error ( Connection Lost: Invalid player data )

Expected behavior
World should load

Screenshots
N/A

Device Info(please complete the following information):

• OS: Windows
• Minecraft Version: 1.20.6
• Version: 1.4.14-1.20.4

Additional context
Seems like a bunch of mixins failed to apply.

[arnokeesman]

1.20.5 version available in the artifacts for the actions run about #50

[500-internal-server-error]

Thats nice for local testing, but unfortunately I can't use it until it's merged and released on Modrinth, since that's the only way I can get it on Aternos.