I have an RTX 4090 and an i9 14900KF and the same problem. Has this been solved? Also the only options I see in the settings is "Use graphics acceleration when available" and "Sharpen video on all sites" and "Show button on video" in LucidMode.

If I turn off graphics acceleration that solves the YouTube issue, but why should I turn that off for everything in the browser just so I can watch YouTube?