LR shortcuts in Youtube for slowing down and speeding up

Although the shortcuts 1 and 2 work in Netflix for slowing down and speeding up a video, they do not seem to work in Youtube. At first I thought that might be because of a conflict with the Youtube shortcuts (1 skips to 10% through the video, 2 goes to 20%, etc.), but when I turned those shortcuts off with an extension, the 1 and 2 did nothing.

It looks like this question has been asked at least once before (I see it in Sept 2023 here), although that question did not specify the problem was for Youtube. I’m surprised this question wasn’t asked more, and so I wonder if I am missing something. I am using LR in Chome 126.0.6478.127 on Windows 10.

Thanks for your help!