As reported bu user Уксусов Кирилл when using Cyrillic keyboard layout. Typing Cyrillic specific characters will not navigate Artist tree to correct artist.

For Example If you have artist "Љутко" and you press "љ" on keyboard while artist tree node is selected it will not move to "Љутко" Artist.

To Replicate this use Windows Language Settings and Add either Russian Cyrillic , Serbian Cyrillic (I tested on Serbian) or any other Non Latin keyboard layout like Greek,...

Serbian Cyrillic US-Int -> Serbian layout difference:
q -> љ
w -> њ
x -> џ
y -> з