It was most often the case in the Season 1 and 2 temple for multiple doors to be open between the Pit and King's Storeroom, forming a "loop." Many times, a contestant that entered the Observatory could bypass the open Heart Room space and head directly into the King's Storeroom, even though the Heart Room space opened as well. Likewise, contestants that entered the Heart Room space could bypass the Observatory and head directly into the King's Storeroom, even though the Observatory unlocked as well. These doors could be seen unlocking either once the Heart Room space/Observatory objective was completed, or after the King's Storeroom was completed. This "loop"is perfectly evident in runs like Electrified Key of Benjamin Franklin. Another similar example is Silk Sash of Mulan, where Jessie went from the Pit to the Heart Room space, then up into the Observatory; when she was removed, her partner was able to access the Observatory directly. Similarly, in the Golden Stallion of Ali Baba, Kendra was able to form a loop between the central shaft and the Pit. In these two latter examples, the King's Storeroom did not open from either of these rooms, but the overall idea holds true.
Because both the Heart Room space and Observatory were unlocked via the Pit, it would not be surprising if this trend continued for the Priceless Portrait run.