Thanks @k.popp and @encephalon, I’ve already filed this 2 axis scale handle to extrude regression as RH-85318 but it hasn’t been addressed yet. In the meantime, you can use the single axis scale handle + Shift + Ctl/Cmd to extrude at the same time as the uniform scale. If the sub-object selection is planar, the result will be the same as the 2 axis scale handle method.