diff --git a/liberapay/models/participant.py b/liberapay/models/participant.py
index 9bb198442..c92a25d60 100644
--- a/liberapay/models/participant.py
+++ b/liberapay/models/participant.py
@@ -2763,7 +2763,8 @@ def find_partial_match(new_sp, current_schedule_map):
                 if last_pt.id is None or
                    last_pt.status == 'succeeded' or
                    last_pt.status == 'failed' and
-                   last_pt.ctime.date() < (tip.due_date - timedelta(weeks=1))
+                   last_pt.ctime.date() < (tip.due_date - timedelta(weeks=1)) and
+                   tip.due_date >= date(2024, 9, 4)
             ]
 
             # Get the existing schedule