Ensemble: Replies do not correctly overwrite the caller data if they return Some.

I have a fairly complex operation which when I execute it in `Contract A`, will instantiate two `Contracts B & C`. `Contract C` relies on `B`. So `Contract A` will wait for the reply of the `Contract B` instantiation. Then from the reply it will launch another submessage to instantiate `Contract C`. `Contract A` then waits for the reply of `Contract C`. Finally `Contract A` will return a response after `Contract C` replies with the addresses of both `Contract B & C`.

The data set by Contract A from the final reply from Contract C is not being returned in the response in Ensemble:

It is picking the wrong index and setting the data of state[1] when I think it should be overwriting the data in state[0]