A link a member copied used to keep working after that member left the workspace, was deactivated, became a guest, or after an admin changed Who can invite people to admins only. It now stops in each case, and the audit log says the links were revoked. Each member holds one link at a time: Copy invite link gives the same one again. Invite links in Members lists every live link, in pages.
Somebody an admin removed from a workspace cannot come back through an invite link; Restore, or a new invitation by email, brings them back. Signing out on a device that was signed in with a QR code ends everything that sign-in holds on it.