How do I not Avoid a wormhole?

[Rhinestone Cowboy]

Here is the Scenario,

Single player game, My ship wanders into a Mine Field. SEIV creates a box around the wormhole and all my ships start avoiding it.

Later the race surrenders to me and all mine fields change over to my control.

Unfortunately the box is still around the wormhole and my ships are still avoiding it!
The mines now belong to me. I can manually force a ship through the sector.

How do I turn the "Box" off so my ships stop detouring around?

Thanks,
RhinStone Cowboy