Incompatibility with Fabric mods built with Fabric Loom 1.14+.

[QuincyZhang03]

Minecraft version

1.20.1 (LTS)

Describe the bug

Incompatibility with mod built with Fabric Loom 1.14+

Steps to reproduce

1. Install a Fabric mod built with Fabric Loom 1.14+, FFAPI and Sinytra Connector
2. Try to launch the game, and it crashes.
3. Try to rebuilt the mod with Fabric Loom 1.13 or lower, and relaunch the game.
4. The problem is gone.

Logs

No response

Additional context

Hello, I've found that on Minecraft 1.20.1 Forge, mods built with Fabric Loom 1.14+ can't be loaded correctly. And I tried to rebuild it with Fabric Loom 1.13 the problem was gone. Is it to be fixed?

P.S. The Fabric mod used in test : Mishang Urban Construction 1.6.0