You find evidence that conflicts with a signed chart entry. What happens next?

Fictional office case: at 14:10 you signed your own entry, “Printed after-visit information given to patient.” At 14:25, after the patient left, you find the named, undelivered packet in the room. You cannot establish whether another team member supplied a second copy. The office permits assistants to add a dated correction to their own entries through an amendment function that preserves the original. Only the dentist decides whether further clinical communication is needed. The practice manager can help if the amendment function is unavailable.