Dynamic direct lighting not visible in reflection captures

Issue: reflection probes only capture indirect light when directional light is set to stationary.

Current workaround is to manually render a cubemap and use as ‘Specified Cubemap’ in the reflection probe.

From research I found ‘r.diffusefromcaptures 1’ but this doesn’t seem to exist in 4.18.3.

Does anyone know a way for refection capture to update with a fully dynamic scene? I’m not looking to update the captures after initial load, just once on Begin Play.