White loading screen when opening deck options (Qt6)

A couple of days ago I installed the latest version of Anki Qt6 on Ubuntu 20.04 and among some small things the huge one is that every single time when I need to change deck options (any preset) I have to see a shmicking flashbang in my face. And by default, Anki (besides the initial white windows) is using a pretty nice dark theme.
And why new options menu is loading anyway (for about 1 second)? The legacy menu (Shift+Click) shows up instantly, but doesn't have the new V3 scheduler submenu (otherwise I would probably stick to it, instead of the new one).