to figure out if this is a browser issue, you could try those steps first:
If nothing helps, I would try to reach out to the developers of Destiny 2 to make them aware of the issue, because as it seems that it could be a game-problem, Stadia couldn't even help you with that one.
how do you think could this be browser related? These are ingame settings of the game. I think i mentioned this in my post. Is there is any local browser relation to the actual game in the Stadia cloud i don't know? If so please tell me because this would be helpful for the troubleshooting. If not please do not post such generic answers because they are not helpful at all. Thank you
Maybe I misread your post, but it looked like you actually mentioned Chrome extensions, so I suggested to try some browser issues. Sorry if this wasn't helpful at all, it's at least worth a try if you play on Chrome (this was at least what I understood, but well... humans can make mistakes).
If these are ingame-settings, I would recommend you to contact the developer or contact Stadia support to figure out if this is actually a game-problem or a problem with the Stadia controller.
As long as nobody else is having that problem, I think it's very specific. I saw you have posted as well in the Bungie-forum, so I guess if that problem affects multiple people, it would get more attention.
@BinaryJay Yes, I have the same issue. Basically, the key bindings get reset to default every time you start the game up. In other words, settings don't save between sessions. If you use keyboard and mouse, most people set up their own custom key bindings so this is really annoying. Made me give up trying with keyboard and mouse because I don't want to spend 5 minutes every time I log on to set it up.