positive assertion is not mandated, only the negative one, to avoid a…

… stall

node/service/src/lib.rs

@@ -916,7 +916,6 @@ where
 		local_keystore.and_then(move |k| authority_discovery_service.map(|a| (a, k)));
 
 	let overseer_handle = if let Some((authority_discovery_service, keystore)) = maybe_params {
-		assert!(chain_spec.is_dev() || requires_overseer_for_chain_sel, "Precondition congruence (true) is guaranteed by manual checking. qed");
 		let (overseer, overseer_handle) = overseer_gen
 			.generate::<service::SpawnTaskHandle, FullClient<RuntimeApi, ExecutorDispatch>>(
 				overseer_connector,