I tried to deselect undetermined because I thought, that if I just put in my languages that I can speak, I can have a kind of default on new created posts from one of my languages. That has not worked at all but I realized, that undetermined can be deselectetd but wont save in the settings. I think, their was a fix with the aim to prevend user misconfiguring anything in the language area. (best guess)
I tried to deselect undetermined because I thought, that if I just put in my languages that I can speak, I can have a kind of default on new created posts from one of my languages. That has not worked at all but I realized, that undetermined can be deselectetd but wont save in the settings. I think, their was a fix with the aim to prevend user misconfiguring anything in the language area. (best guess)