[UE6 main] LumenRef in recent build

Summary

reproducible on clean build,
When trying to visualize LumenRef I get the error message
Current RHI does not support Shader Execution Reordering

Running D3D12 and SM6 on RTX A5000

What Type of Bug are you experiencing?

Rendering (Graphics / Niagara)

Steps to Reproduce

r.LumenRef.Visualize 1 after LumenRef is enabled

Expected Result

should work without errors

Observed Result

see summary

Affects Versions

6

Platform(s)

Windows

Environment
Threadripper 1950X, 64GB RAM, RTX A5000, D3D12 RHI, Windows 10, engine built via command-line Build.bat (not full VS solution build), current tip of ue6-main at time of report.

Note
LumenRef was working fine in earlier builds, exact same hardware

Question - is there now a hard dependency on more recent GPUs supporting SER and or SM6.9 for LumenRef to work?