Fix panic when post-verifying Precommits in log

Notes an edge case which enables invalid commit production.

coordinator/tributary/tendermint/src/round.rs

@@ -57,6 +57,14 @@ impl<N: Network> RoundData<N> {
 
   // Poll all set timeouts, returning the Step whose timeout has just expired
   pub(crate) async fn timeout_future(&self) -> Step {
+    let now = Instant::now();
+    log::trace!(
+      target: "tendermint",
+      "getting timeout_future, from step {:?}, off timeouts: {:?}",
+      self.step,
+      self.timeouts.iter().map(|(k, v)| (k, v.duration_since(now))).collect::<HashMap<_, _>>()
+    );
+
     let timeout_future = |step| {
       let timeout = self.timeouts.get(&step).copied();
       (async move {