fix: announce burnchain block

testnet/stacks-node/src/run_loop/neon.rs

@@ -270,6 +270,11 @@ impl RunLoop {
             })
             .unwrap();
 
+        // We announce a new burn block so that the chains coordinator
+        // can resume prior work and handle eventual unprocessed sortitions 
+        // stored during a previous session.
+        coordinator_senders.announce_new_burn_block();
+
         let mut burnchain_tip = burnchain
             .wait_for_sortitions(None)
             .expect("Unable to get burnchain tip");