I have a similar problem, which persists.
I will try reporting it as a bug as indicated by @benjito.
Btw, I carried out the test again and although saving current settings as a preferred setting caused the komi to change from automatic to 0.5, when I selected ‘Use’ the Komi remained as ‘automatic’. However, when I tried to extend the test and use a different, specific komi, I found that Custom komi was not allowed. I don’t understand why not.
I think it would be an excellent idea to be able to name a set of preferred settings, especially if others could adopt the settings just by reference to the name.