Rotating Directional Light just stretches Light Function from centre

Development Rendering
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1

I am trying to set up a rotating sun / directional light with a light function for cloud shadows.

When I rotate the sun actor around the X or Y axis the light function is stretched in the same direction, regardless of which direction I rotate it.

To reproduce:

  • Add a Directional Light with a light function (mine just uses a panning noise texture), facing downward.
  • Rotate the Light in each direction, around the X (or Y) axis.

This is the result I got:

Gif 1

Gif 2

edit: Added links to two GIFs to hopefully make the problem clearer,
and I have tested it in an empty project in 4.18.2 and the problem still exists.

2

That much makes sense, but my issue is that it isn’t stretching correctly.
If I rotate the directional light to two completed different directions it produces the same result, which doesn’t seem right to me.

3

Light function in directional light works like projected texture, and itwill stretch in some angles.