[meowface]

That's funny because it's the exact opposite for me. I'm on desktop and I see it only when logged in. When not logged in, I only see replies.

[code_duck]

I have made more observations and it seems to have to do with how you arrived at the post. If I click on it from browsing my timeline, it does not show “more tweets“. If I click through to it from a link somewhere external, such as a link in an article, it does. I’m sure that somewhere there is a thorough analysis of this.