Ships in reverse behave in ways that are non-intuitive (https://en.wikipedia.org/wiki/Propeller_walk). Depending on the direction of the prop walk it could compound the problem.
Another artifact of traditional (non-azimuth) propeller driven ships in reverse is that they have very little steering control if they are moving slowly as steering requires water moving over the rudder. In forward water is actively being pushed over the rudder due to its position behind the prop, but in reverse this flow is not as strong.