diff --git a/scripts/pi-diff.sh b/scripts/pi-diff.sh
index 6bbd252..5722de3 100755
--- a/scripts/pi-diff.sh
+++ b/scripts/pi-diff.sh
@@ -92,6 +92,22 @@ diff_scenario() {
       .ccgram-uploads/*|*/__pycache__/*|*/.venv/*|.venv/*|*.pyc|*.bak-*|\
       telegram-gateway/*|download.html|.pi/launch.json|*.log) continue ;;
     esac
+    # Vendored shared modules are installed by deploy-scenario.sh and are not in
+    # the scenario's workspace/, so compare them against shared/extensions/
+    # instead of reporting them as untracked -- otherwise the one file most
+    # likely to drift is the one the diff stays silent about.
+    case "$rel" in
+      .pi/extensions/_shared/*)
+        mod="${rel#.pi/extensions/_shared/}"
+        src="$REPO_ROOT/shared/extensions/$mod"
+        if [ ! -f "$src" ]; then
+          untracked+=("$rel (no longer in shared/extensions)")
+        elif ! diff_file "$src" "$workspace/$rel" "$rel (vendored from shared/extensions)"; then
+          DIFFS=$((DIFFS + 1))
+        fi
+        continue
+        ;;
+    esac
     [ -f "$dir/workspace/$rel" ] || untracked+=("$rel")
   done < <(cd "$workspace" && find . -type f -printf '%P\n' | sort)