[UE6 Main] LumenRef stopped working in recent build

Summary

UE6 Main —
Built from source on 08-27

What Type of Bug are you experiencing?

Rendering (Graphics / Niagara)

Steps to Reproduce

r.LumenRef.Supported=True (in DefaultEngine.ini)
On launching a new project
r.LumenRef.Allowed 1 (in cmd console)
Result?
No difference in viewport.
r.LumenRef.Visualize 1 also does not work and shows an error message
“Current RHI doesn’t support Shader Execution Reordering”

Was working on previous build.

Expected Result

LumenRef mode should be visible in viewport

Observed Result

LumenRef not visible

Affects Versions

6.0

Platform(s)

Windows

Additional Notes

Was working in previous build from UE6 main.
Question
Is there now a hard dependency for SER?

When I try and visualize LumenRef I get a error message saying
“Current RHI doesn’t support Shader Execution Reordering”

I’m on SM6 but have an older RTX A5000 which I think only supports up to SM 6.8 and SER I believe requires SM6.9 support.

Getting the same error, I’m on RTX 3090. Unfortunately only RTX 4000 series and up support Shader Execution Reordering (SER).