I have built a version that can run on 1.20.1 forge server. You can add this file to the download pages if it is possible.
我编译了一个1.20.1forge服务器修复版，可以的话加到下载页里.

https://wwtm.lanzouq.com/iM3du1625p3i

MTR 3.2.2 hotfix-2 for Forge should have fixed the issue

建议你直接开 Pull Request 去把你的代码提交合并请求，而不是直接丢一个二进制文件。

I suggest you could open a pull request to merge your code into the repo instead of just giving a binary file.

@kettle-7 Could you please have a look at this file I have built?

Yeah sending binary files is a great way to make people think you're up to no good lol

but 1.20.x will be supported in 4.0.0; i don't think there's plans to support servers with 3.x and 1.20.x