try

.github/workflows/CI_readme_sync.yml

@@ -35,7 +35,6 @@ jobs:
           dir_names_exclude_current_dir: true
           # We only care about the name of the integration, i.e. integrations/FOO
           dir_names_max_depth: 2
-          separator: '\n'
 
       - name: Generate docs
         env:
@@ -46,7 +45,7 @@ jobs:
           ALL_CHANGED_DIRS: ${{ steps.changed-files.outputs.all_changed_files }}
         run: |
           for d in "$ALL_CHANGED_DIRS"; do
-            echo "$d was changed"
+            echo "$d was changed\n"
           done
 
       - name: Sync preview docs with 2.0