Open 'Grid and Axis Manager' and activate 'Mode: Cube'
Click in the input fields for First, Second or Up Axis and modify the value either by typing in a new number or with the mouse wheel > the preview cube to the right does not update.
Click on the preview cube and move it around > the input field values to the left get updated accordingly.
Same applies to the Up Axis widget.
Note: modifying values in the input fields E, O and R works as expected.
d.