Status: Workaround available
A white halo artefact presents itself around hair when using ray tracing and hold-outs with the Ncam AR Suite virtual overlay compositing pipeline. Specifically, the issue occurs when the hair is in front of any hold out that has an unlit surface material. As the NcSkyHoldout mesh that is supplied as part of the plug-in's content uses the unlit NcShadowHoldOutUnlit material the issue will present itself when hair is rendered in front of it.
The workaround to the issue is to change the material type of any hold-out that might be rendered behind hair from "unlit" to "default lit". The easiest way to do this is to change the material to be the "NcShadowHoldOut" which is a "default lit" surface material. This is illustrated in the image below: