Same problem for me as well. Im running Stadia via Chrome on a Late 2015 iMac. I use the magic keyboard + magic mouse (2nd gen) which worked perfectly until two days ago where the mouse works fine in...
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Same problem for me as well. Im running Stadia via Chrome on a Late 2015 iMac. I use the magic keyboard + magic mouse (2nd gen) which worked perfectly until two days ago where the mouse works fine in the main menu but as soon as the game starts (Cyberpunk 2077) i can only use left and right clicks...pretty frustrating. I will be getting the stadia controller soon but i do prefer to play some games using the keyboard and mouse. Hopefully an update can fix this.