I have the global version of STYJ02YM Xiaomi Mi Robot Mop P.
In Mi Home app there are 3 options: Vaccum, Vaccum and mopping and Mop. When I put Mop only it says the water tank is not installed. But when I install the tank it say: Water tank installed. So I don't understand why vaccum + mop work and mop only doesn't. Is this some kind of bug or firmaware thing?