When using cursor on a live-shared (from either cursor or vs code) project, files are not possible to reference via chat on either composer or chat via @ mention.
They can be added via the “add context” button, so they are being indexed, but they cannot be referenced via @mention anywhere.
Folders and even code can be referenced, but not files.
This happens on macbook laptops (arm) as far as I’ve been able to test.