Hello there,
I have tried your 1.12.2 version of this mod,
When i try to type 127.0.0.1:9050, it will say Proxy: None.

I found a way to still use it, and that is to edit the config file.

same issue here in 2024

I have not bothered to fix it myself, however, you can simply edit the config file manually.
Best of Luck.