It changes day to day. I haven't logged in to Twitter in over a decade. I haven't been able to go to mobile.twitter.com and do anything in years, just gives me a sign up page. I can follow a link to a tweet and use the search from there. But in the last week or so if I tap a tweet or a search result I get sent to a sign up page. This behavior varies over time.
Yeah, I just started seeing this recently too. I blocked all those sign-up elements with UBlock but I still can't scroll. Refreshing the page once or twice usually makes it start working though.
Anyway, datapoint, works for me.