Maybe it’s the same issue as this thread? In newer engine versions there’s a cvar in the to control the texture format for Lumen, which can eliminate the yellow bias. I don’t know the name of it off the top of my head, but it’s something like “r.LumenTextureFormat” or “r.LumenColorFormat.”
I’m not in a position to check right now but I can later and will update here if you’re still stuck.
Update: It’s “r.Lumen.LightingDataFormat”