The thank you for sharing webpage which comes when we send feedback on the Stable Channel is not in dark mode even if the browser is in the dark mode as seen in the screenshot whereas the page for the Insider channels is working correctly. I have sent feedback about this through the in-app feedback tool but no updates are given that the team is working on the feedback. @David Rubino
The thank you for sharing webpage is in light mode even if the browser is in the dark mode.