OH! I hadn't even noticed that the dial had moved from S! Thank you! 🙏🏼 This is something I hate about this camera - this dial moves on its own, you can't fix it so it doesn't move onto a different setting! 🤦🏻
I noticed some of what you are describing, but in my images, the difference seems more related to the body than the chosen simulation. Images from my X-T10 are slightly more yellow tinted than the ones from my X-T30 or X-T30 II (or the newer bodies have slightly more neutral auto white balances than the older one does if you want to think of it that way).
I shoot raw and use Provis as the base simulation in all of the bodies because it is so neutral to start with, I can tell during a quick image playback if I have over-cooked an exposure.