Cloaked ships can get by mines?

[Suicide Junkie]

I have had enemy ships floating around my space for many turns before they decide to attack.

Once I discovered cloaked ships attacking past my defense fleets, I tossed 500 mines on each wormhole into my two starsystems. Many turns passed, with cloaked ships regularily blowing up in my minefield. Half a year later, they attacked with a cloaked force.