I'm not an expert on the actual biological mechanisms, but, it makes intuitive sense to me that both of those effects would occur in the situation you described from simple cells working on gradients: I was one of the authors on this paper during my undergrad[1] and the generalized idea of an eye being placed on a tail and having nerves routed successfully through the body via pheromone gradient is exactly the kind of error I watched occur a dozen times while collecting the population error statistics for this paper. Same thing with the kind of error of a face re-arranging itself. The "ants" in this paper have no communication except chemical gradients similar to the ones talked about with morphogen gradients. I'm not claiming it's a proof of it working that way, ofc, but, even simpler versions of the same mechanism can result in the same kind of behavior and error.

[1]: https://direct.mit.edu/isal/proceedings/alif2016/28/100/9940...