Edit View Orientations: Can't rotate orientation about X-axis!
I'm trying to create a custom view orientation. No matter what I do, I can only rotate the view orientation about the Z- and Y-axis, but not about the X-axis.
When I change the numerical value either in the X- or in the Z-angle input box, the view orientation always rotates about the Z-axis and never about the X-axis.
The attached screenshots show different angle values entered in the X- and/or Z-angle input box. It can be seen that the angle always changes about the Z-axis and never about the X-axis.

1. Start: X-angle and Z-angle are zero

2. Changed the Z-angle -> view rotates about Z-axis ✅

3. Changed the X-angle -> view rotates about Z-axis ❌

4. Changed both Z-angle and X-angle -> view does not rotate at all, Z and X cancel each other out ❌

