I don't know if anyone else is having this problem, but on my end, UMD stopped showing night mode. I am getting this issue on Chrome (Windows), Chrome (Android), and on both my cable internet AND 5G.
I have had it come and go on my phone as well recently. I figured it was tied to my upgrading my phone. I will say that I do not see it using the Brave browser. I am also running Linux.
Some kind of fault overnight, seems to be back to normal now.
Dark mode should be the default, bright white websites are an abomination and when I am anointed God Emperor of Earth, anyone with a default white website will be made to pay extra taxes.