Not sure if this is a stadia exclusive issue (or even only when playing on CCU with controller) but there is this weird thing going on in the equipment screen where you get the info for another item than that which you should have currently selected.
Usually it's the previous item in the direction you're moving the selection (e.g. when scrolling from up to down , you will see the info for the item above the currently selected item). Needless to say, this makes equipping items even more confusing than it already is because of the weird 'equip to current selected char' instead of the 'equip to current selected item-slot' thing in the game (not sure if this is a bug or feature btw
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While i'm quite sure it will be fixed by release and also really appreciate the 'beta' controller support on stadia, just thought it might be worth to mention it as for the rest I am actually quite happy with how the game plays on stadia+controller given it's not 'officially' supported yet I haven't run into many other issues.