According to some people on here, you should not be playing back test patterns as they are not real video and nobody would ever notice a difference even though you just spent 1000’s on a top end tv and calibration equipment 
Anyways, there is definitely picture degradation when HDR MaxXXX is not passed through - its obvious. Vero 4K+ does not currently pass these but will do soon. Looking fwd to checking the test patterns - oops ….
My Odroid N2 does pass HDR metadata correctly and the difference is obvious. Same with my Oppo Bluray streamer vs Vero 4K+. PS Odroid N2 has potentially slightly better pic quality then the Oppo as the new Mali GPU in Amlogic S922 devices has better chroma upscaling than the Oppo Mediatek. Once again, easy to spot on Spears & Munsil UHD benchmark disk. But you know what they say about these things ………
Edit : meant to say, I would just wait for the MaxXXX fix and take it from there.