It may re-attach provided it fixes the damage. Lost cells will be replaced through cell replication. Individual cells are expected to monitor and maintain their own health. Such sick cells are potentially dangerous. They will be aggressively attacked by dedicated phagocytes and cleared away together with their spilled contents.
Phagocytes pay little attention to cells that are in junctional communication with each other.
These cells are stable and healthy. They use a docking system to attach their uropod to an underlying block of communicating cells. This docking by the uropod has low specificity. It is able to attach to allogeneic and even xenogeneic cells. Dedicated pathogens may find ways of fooling this surveillance.