A stub keeps its items and their templates, so a held module still contributes to other modules' collections; it drops only the templates for its own files (issue 1126)

go/compose/composed.go

@@ -318,10 +318,15 @@ func Stub(m catalogue.Manifest) catalogue.Manifest {
 		m.OwnsPaths = catalogue.DeclaredPaths(m)
 	}
 	m.Build = nil
-	// Nor is anything of its own handed or collected: the templates and items its build kept fill resources and items a
-	// stub does not have (issue 1126: novox's node refused "postgres: its build kept a template for consumers, which it
-	// does not declare" with postgres held).
-	m.Handed, m.Items = nil, nil
+	// Nor is a template its build kept for its own files handed: a stub carries none of them (issue 1126: novox's node
+	// refused "postgres: its build kept a template for consumers, which it does not declare" with postgres held). Its
+	// items stay, and the templates they render through: a held module's contributions to other modules' collections
+	// (seat contributions, shell blocks, seat data) still reach their collectors.
+	if m.Handed != nil {
+		h := *m.Handed
+		h.Templates = nil
+		m.Handed = &h
+	}
 	var dirs []map[string]any
 	for _, r := range m.Resources {
 		if r["type"] == "directory" {