Just posting up that my UR22 does exactly the same thing; overloads the signal on HiZ, even with the gain all the way down. This happens on pretty much every guitar, ranging from single coil Strat, mid gain humbuckers, and higher gain (but still passive) humbuckers. Even a piezo will overload it.
Come on Steinberg. This is false advertising when so many guitars can so easily overload the device with the gain all the way down. I’d love to know which guitars you guys tested this with, because like I said, even with singles it does it.
Contrast that with my old Presonus 44VSL, my Line 6 UX2, and my Tascam US122L, and NONE of those had any issues. Really quite disappointed with this unit.