Warp Points that Disallow Basic Sensors and Mines

Question: Do ships that pass through warp points that stop basic sensors from functioning hit mines planted there? I was playing a game and had ships positioned to guard a warp point, and an enemy ship appeared in my system the next turn. The turn following that he colonized a planet, again bypassing the ships positioned at the warppoint. At first I thought it was a bug, then I noticed that the warp point messes with basic sensors, so I figured the ships just didnt see each other, so they didnt fight. (maybe this is a bug anyways). So before I spend the research points, would the ships hit mines, if I placed them there?

-unnamed