Bug Report - Map Fully Revealed after TP

I just TP'd out of a T2 Sunken City map to sell an item. When I zoned back in, my full minimap for the map was revealed, with no greyed out spots at all. The map contained Ritual, Ultimatum, and a Trial of Ascendency. I can't think of anything else special that happened to make it. (for the record, I never went to the very bottom section of the map at all.)