fix name

tournaments/models/round.py

@@ -159,7 +159,7 @@ class Round(SideStoreModel):
             else:
                 first_half_matches = list(matches)  # Convert QuerySet to a list
                 if self.index == 0 and loser_final:
-                    loser_match = loser_final.match_set.first()
+                    loser_match = loser_final.matches.first()
                     if loser_match:
                         first_half_matches.append(loser_match)