UE 5.4 - Specular/reflection disappears above 4096 resolution render

After a viewport is more than 4096 pixels wide, Lumen's specular reflections buffer cuts its width off at 4096 pixels.

It appears that the affected buffer is "Lumen.Reflections.ResolvedSpecularIndirect[0]"

Also tested and reproduced in //UE5/Main, CL: 35080611.

1. Download the Licensee's test project and open
https://udn.unrealengine.com/s/contentdocument/069QP00000F20hdYAB

Option 1:
2. Scale the viewport resolution until it is greater than 2048 pixels wide. You might want to keep the height low for performance.
3. Set the viewport screen percentage to 200
4. Observe the right-hand side of the viewport no longer has specular reflections

Option 2:
2. Open the Level Sequence "/Game/testRender"
3. Render the Level Sequence using the config asset "/Game/MRQ_4320px"
4. When the render is done, open the produced frames in the "/<project>/Saved/MovieRenders/" directory.
5. Observe that the right-hand side of the viewport no longer has specular reflections.

[UE-23848] Bug Status

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