there may be more than one cascading PR from the same origin

and they are different because the destination head is different

.forgejo/workflows/integration.yml

@@ -4,6 +4,7 @@ on:
   push:
     branches:
       - 'main'
+      - 'v*'
   pull_request:
 
 jobs:

cascading-pr.sh

@@ -77,7 +77,7 @@ EOF
 }
 
 function pr_destination_title() {
-    echo "cascading-pr from ${options[origin_url]}/${options[origin_repo]} ${options[origin_head]}"
+    echo "cascading-pr from ${options[origin_url]}/${options[origin_repo]} ${options[origin_head]} to ${options[destination_head]}"
 }
 
 function pr_destination_body() {