This is worse for the 936 than this article and Philips are saying. It is not only when paired with VRR/Dolby Vision - The 936 cannot achieve 4K/120 at all despite being advertised as 4K/120. It drops half the vertical resolution in any 4K/120 mode.
This was brought up by Vincent @ HDTVTest in his review and I have easily replicated it at home. Even in Monitor Mode with no VRR/DV etc you instantly see the drop in resolution when switching from 60 to 120.