(Sorry for bad English, if it's here)
Let's assume that i created 2 rules and 2 modsets:

Then i am trying to disable "Client mods" and this happens:

It's not working, But if i do "Undo" button:

Now it's working and if i do this:

It's also working (I showed here wrong tab but just trust me). BUT if i swap "Rule" and "Modlist" tabs (swap the names of "1.json" and "2.json" files) the bug occurs from "other side":

There is config files if needed:
1.json
2.json
modsets.json

I want to implement this mod in my modpack but this bug makes everything worse.

It's looks like a bug of YACL. But YACL seems dropped 1.19.2 support. You can try to open an issue on their Github and link back for tracking

Not sure about opening issue on YACL. The last version of YACL is 2.2.0 but mod sets accepts 1.7.1 YACL and bellow. Maybe it was fixed in 2.2.0 but i can't test it.