I have seen this bug before when orbiting Duna, but I thought it was a fluke, or related only to Ike. But now I have seen it with Tylo as well. I am not sure if it is a problem only with moons or all celestial bodies. Basically, my map isn't showing an upcoming encounter. Then suddenly I am in the SOI. I tried reloading, making an earlier maneuvering point, but the encounter never shows up until it is too late. Has anyone else encountered this and have some sort of work around? Or is it another bug that just has to be accepted? Here is an example of what I am seeing.
Here I have setup a braking maneuver with Laythe. According to the map, I will pass by Tylo:
A couple hours later, I have this: