Mac OS Sequoia 15.2 appears to have broken Dark (appearance) mode

I updated my operating system from Mac OS Sequoia 15.1.1 to 15.2 this morning. I work in Dark (appearance) mode. Everything was working fine until I updated the OS this morning. Ever since (and there's been no other change), when I visit YouTube and attempt to leave a comment on a video, my Mac wants to type BLACK letters on the BLACK background. It works correctly when I put it in Light (appearance) mode (typing black letters on the WHITE background). But when in Dark Mode, it doesn't remember to change the font to WHITE when typing on what is now a BLACK background, making it impossible to see what I'm typing.

This problem started immediately after I updated the operating system. Apple tech support tells me I should contact YouTube on this. But the problem only started after I updated the OS.