Question: Rationale for result.nonces_after.len() == 1 restriction in process_simulation_task_result

[bhes74930321]

What is the purpose of the constraint result.nonces_after.len() == 1 in simtree.process_simulation_task_result?

   // we don't really need state here because nonces are cached but its smaller if we reuse pending state fn
    fn process_simulation_task_result(
        &mut self,
        result: SimulatedResult,
        state: &NonceCacheRef,
    ) -> Result<(), ProviderError> {
        self.sims.insert(result.id, result.clone());
        let mut orders_ready = Vec::new();
        if result.nonces_after.len() == 1 {
           ...