Required Mod List not working as expected

In the External APIs section of the workspace settings there is a list input box where you type the mod ids of the mods you want to be required dependancies. well I tried to input one and then I looked at the mods.toml were they are stored and the mandatory setting is still set to false. I tested the mod id in just the dependencies section and it was the same. then I tried it in just the required mods section and then looked at the file, the dependency wasn't even there.

Am I misusing this system or do I need to open an issue ticket?