Youtube videos fail to load

When I’m logged in on my main Youtube account, the video frame for videos is completely black. The video fails to load and the number in the corner that indicates the video length keeps switching from 0:00 to the actual length of the video. If I use a different account, go into incognito mode, or disable adblocker, my video loads. I’ve also tried switching to adblock-only mode, updating everything in brave://components, and disabling or deleting all of my web browser extensions, but that didn’t help. After ~1 minute of the video failing to load, the black frame is replaced with a gray rectangle and a “Video unavailable” error. What could be causing this, and how can I get videos to load adless without having to switch accounts?

--Update 1: I switched from regular Brave to Nightly, and the video says “Video unavailable” whether I’m in normal adblock mode or adblock-only mode. It does load with adblock off, though.

--Update 2: I completely turned adblock off on Brave, and video playback still doesn’t work.

On-going issue / “running battle with YouTube (Google Eco-System) account holders”