dark mode

Hey guys, I'm reaching out to the community to see if anyone else has been having issues with the heartbeat extension for Google Chrome? At first it was fine and I had no issues, but a month into using the extension I noticed my "Dark Mode" wouldn't work anymore on Youtube and now I can't...

Here recently my YouTube dark mode has not been working. I used to have it on YouTube but all of a sudden it just randomly stopped. I tried reinstalling heartbeat to my Google Chrome and it still seems not to work. Any help or ideas of what may be wrong??