cache only embedded templates

src/assets/assets.go

@@ -35,8 +35,10 @@ func Render(path string, writer io.Writer, data interface{}) {
 				return template.HTML(content)
 			},
 		}).ParseFS(FS, path))
+		if FS.embedded != nil {
 			FS.templates[path] = tmpl
 		}
+	}
 	tmpl.Execute(writer, data)
 }