UE 5.8 Release - Lumen Reflections not working unless Lumen GI enabled

General Issues and Bug Reporting (Unreal Engine)
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Summary

In UE 5.8, I am unable to get Lumen Reflections to function unless Lumen Global Illumination is enabled.

It works fine in my 5.7 editor but not in 5.8.

What Type of Bug are you experiencing?

Rendering (Graphics / Niagara)

Steps to Reproduce

Enable Hardware Ray Tracing
Use Hardware Ray Tracing When Available
Ray Lighting Mode is Hit Lighting or Hit Lighting for Reflections or Surface Cache
Turn off Lumen
Keep lumen reflections enabled

Expected Result

Lumen GI is disabled but the reflections in the scene are still handled by Lumen Reflections

Observed Result

Immediate fallback to Screen Space reflections in all configurations except when Lumen GI is enabled.

Affects Versions

5.8

Platform(s)

Windows

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ue is using ssr fallback (no lumen gi used, hitlighting reflections). and in editor you won’t have this issue, neither development build, doesnt work only in a packaged shipped build

4

Can confirm this bug on my end too

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I just tried to reproduce it on latest and I can’t. What kind of an error message do you get when you enable Lumen Overview view mode? You can do it from the viewport editor controls or by using r.Lumen.Visualize 1.

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@Kappa @gotormak Would either one of you be able to provide the error you are seeing? We are unable to reproduce.

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UE-391621’s status has changed to ‘Ready for QA’. A member of the QA department is investigating the issue.