I know there's similar problems with this already in here, but I wanted to display another possible version of it. I was playing historic brawl, with Roxanne as my Commander, and my opponent had muldrotha (the Final Fantasy Version). They had in their graveyard an Uro, and also enough cards to escape it. In my turn, I used Mindslaver and took control of my opponent's next turn. While controlling them, I held my priority normally while casting Uro from their graveyard, so I could cast wash away from their own hand on it. I'm not sure if it didn't let me cast wash away for 1 blue (cause I think there was enough mana only to cast it for one) because of a bug, or if it was because the game didn't let me retain priority as my opponent, because the only option was for me to let it resolve. When I clicked it, it entered the battlefield. So please, investigate this, and either fix the wash away bug (that is apparently already a thing), or just let me hold priority as my opponent while controling their turn.