I found it annoying that when I input a XYZ coordinate while the top viewport is selected, the first two numbers are used for the XY and the Z number is ignored. It would be nice if Rhino recognize the difference of a XYZ input and a XY, XZ or a YZ input. Can you put this on the wish list?
Undecorated coordinates are assumed to be CPlane coordinates.
If you include a “W” in front of your coordinates, then Rhino knows you want a “World” coordinate instead of a CPlane coordinate and I think you’ll get what you are expecting.