I wouldn't call it a bug but I am having UI trouble with Stadia controller. Whereas the popup menus on their web browser have tooltips or labels on mouse hover, there's no equivalent for the controller. As an example, casting something like disguise self on computer opens a box where you select the tile of the desired race/gender. With a controller none of these tiles are distinguishable from another forcing the player to play a race/ gender roulette until you win or run out of spell slots.