Mine charges my laptop OK. Pretty sure they just do pass through, so the device negotiates the PD as usual. I think it's more likely that it wouldn't work for

Mine charges my laptop OK. Pretty sure they just do pass through, so the device negotiates the PD as usual. I think it's more likely that it wouldn't work for a USB 3/TB dock thing as I imagine the high-frequency signal integrity is trashed by such a thing.