As I said in the title, I tried to use the new fabric version for my modpack, but installing the mod makes the game crash while loading.

Here's the log on mclo.gs: https://mclo.gs/1KpZXan

Here's the log in a more permanent way: 1KpZXan.txt

Error Snippet (from log):

[17:48:54] [Render thread/ERROR]: Mixin apply for mod create_power_loader failed create_power_loader.mixins.json:GlobalRailwayManagerMixin from mod create_power_loader

Minecraft version:
1.20.1
Fabric loader version:
0.15.6
Power loader version:
1.4.0

Thanks in Advance for help!

Thanks for the detailed report. It's caused by mixin remapping issues and is fixed in 1.4.1-fabric