Select your first/second/third champion rewards are bugged

See linked gif how it looks like. Always reproductable on a 2 monitor setup with 1920x1200 resolutions. Works fine if client is opened on a single monitor 1920x1080.

Can't progress further as this screen blocks everything and cannot be skipped. Seen multiple threads but without response and this is still happening 3 months later.

Workaround: When client starts it's sometimes possible to click not yet visible button, then OK is active, really hard to do. (Faker apm mouse skills required)