I don't believe this bug has been documented here, I couldn't find it by looking and apologize if it's a duplicate. Sometimes, often in the same burn, the conics of getting an intercept with another body won't render, making it appear one would be outside the SoI of said body.

I think this is actually a stock bug, it happens all the time when I'm trying to get to the mun or moho - Conics 0 might be a little too accurate :P

DMP doesn't touch conics, and I've seen this in stock. Closing ;)