It works fine for me, give me link of the video that the icon doesn't appear under so I can see from where the problem... Here is proof that it still works for me: https://i.imgur.com/UGb33ef.png
Edit:
The post you shared isn't a video, it's a photo the extension only works with videos now. Here is a screenshot for a video on the same channel. you can try with this link if the icon doesn't show up tell me to see if there is a problem with it.
