--- a/primitives/data-structs/src/lib.rs
+++ b/primitives/data-structs/src/lib.rs
@@ -426,7 +426,7 @@
 		}
 	}
 	pub fn nesting_rule(&self) -> &NestingRule {
-		static DEFAULT: NestingRule = NestingRule::Owner;
+		static DEFAULT: NestingRule = NestingRule::Disabled;
 		self.nesting_rule.as_ref().unwrap_or(&DEFAULT)
 	}
 }