Hey there,
This is something we’ve seen reported before. When you switch between conversations, the chat can open scrolled to the top instead of at the latest message, and on longer chats the messages sometimes don’t render until you scroll a little. It comes down to how the chat transcript restores its scroll position and paints, and it’s an area we’ve been actively improving.
There’s a long-running thread where we’re collecting reports of the scroll-position part, so it’s worth following and adding your report there: Chat view scroll position resets when switching between conversations.
I don’t have a clean fix to hand beyond what you already spotted (scrolling nudges the messages to load), but rendering improvements have been landing in recent builds, so keeping Cursor on the latest version is worth doing. I’ll follow up here if there’s news.