This only happens for a specific group (per session), which will typically never load until you restart studio and try again. The “specific group” seems to be random depending on the state of studio when it initially loaded. Maybe if it fails to load it never retries?
This occurs for me randomly on every single tab of the experience selection-screen (including my personal games), when it occurs, it either loads ~10 games or none. If the former occurs, hitting the reload button will cause games to load again, if the latter occurs, there is no way to recover except a full restart.