Currently all sailling ships in game roll up their sails in the way of square rig when idle, but its quite odd when applying on Asian ships like War Junk, Fuchuan, Fune and Wokou Junk.
In reality, horizontal spars of Asian sailling ships are usually not stay at a certain height on a mast. When ships anchor, sailors will lower those horizontal spars and not rolling up the sails. Here is a video shows how junk rigs actually works (1:42):
To Fune, it’s simillar, this video shows how a modern reconstructed traditional Japanese sailling ship raise its sail.
Hope devs could change the sails of Asian ships, to make them more accurate!