Companion for substrate#9138 (#3294)

* fix babe params

* update Substrate

Co-authored-by: parity-processbot <>

polkadot/node/service/src/lib.rs

@@ -820,6 +820,7 @@ pub fn new_full<RuntimeApi, Executor, OverseerGenerator>(
 			babe_link,
 			can_author_with,
 			block_proposal_slot_portion: babe::SlotProportion::new(2f32 / 3f32),
+			max_block_proposal_slot_portion: None,
 			telemetry: telemetry.as_ref().map(|x| x.handle()),
 		};