[0.16.22] Minimap "black" tiles are transparent

[Jon8RFC]

The square shown on the minimap, which is transparent, is a yet-to-be-uncovered an inaccessible part of the map. You can see the laser turret through this square, but the rest of the tiles on the map are opaque.

[posila]

Thanks for the report.
It's not a bug (but it might change in the future)