Lumen changes: 5.4 v 5.6 (Soft Source Radius)

[Warner_V (Warner)]

Looking at moving from UE5.4 to UE5.6 I came across the following:

Lumen is reflecting PointLights very differently when using a Soft Source Radius to create pleasant (soft) reflections:

UE5.4:

UE5.6:

Basically, changing the Soft Source Radius has barely any effect anymore, apart from some strange exaggerated response to Bloom (which I’ve turned off for the sake of demonstration). The result is a very different overall scene.

Has anyone come across this issue? Any workarounds?

[Warner_V (Warner)]

Now confirmed to be an issue in 5.6 but not 5.7, and only with SubStrate enabled. I’ll make a bug report, but I don’t believe a 5.6.2 revision is in the works..