When you say it doesn’t work, is it that it doesn’t appear at all in the lesson page ?
Because that’s an issue I am facing and I think it’s related to a problem between chrome and Tampermonkey. I refresh the page until it works.
It has been reported in other threads that one way of fixing it is to change from Tampermonkey over to ViolentMonkey. I haven’t done it yet since I am too lazy to reinstall all the user-script. I was low-key hoping the issue would be fixed quickly. But this issue has been running for a month now on my end, so I think I will do the switch shortly.
Not sure if it’s what you are facing though, but here is the thread I mention, just in case