I have installed two (2) reinforced doors in one of my facilities/ships. Both access stairways.

The icon of both doors are a square with a dot in the center whether they are locked or unlocked. I find this confusing.

Is this the intended icon, is dev work in progress or should I report this as a bug?
Thanx for your time.

I should have added that the reinforced lateral doors either North/South or East/west are obviously different from "Standard" doors.

It is only the doors for stairways that are confusing.