10:15:10 is with and 10:18:01 is without adjust refresh rate.
Without adjust refresh there’s still the color issue, but the full clips plays.
With adjust it clips out after ~10 seconds (before you see the girl+christian bale)
edit: I might be on to something-
After some more testing we have found that none of the LG TVs support chroma 4:4:4 when in a HDR picture mode, regardless of the input icon. This can be seen here . from LG B6 OLED Review (OLED55B6P, OLED65B6P) - RTINGS.com
It seems 4:4:4 is possible if I change my input icon to “PC” which disables several movie settings, but apparently it’s a no-go for HDR 
edit2: if I comment out the attr in rc.local I can play files normal again, but with flickering HDR material (moreso at 24fps than 60). I uploaded a small video where I first play a clip from Arrival via USB on TV (hdr) and then switch over to the vero4k box https://www.youtube.com/watch?v=1nihFOKFBdQ , it’s hard to capture but I think you can see the flickering in the sky. If I turn off the adjust refresh there’s less flickering but it’s still there.
Not quite sure what to do at this point, seems there’s some issue with this configuration and the TV. Is there a way to force 4:2:0 10bit? (I tried changing the rc.local to that but everything went green’ish so not very useful)
edit3: 
When I didn’t have adjust refresh rate the file would actually play at 1080p60hz (since I had Kodi at 1080p) VIC:16 in UI and VIC:93 in movie.
If I change the UI to 2160p60 it seems to work fine (perhaps some color banding in skies) but disp_mode reports VIC:353.
So uh, if I use 2160p60hz in Kodi, and I set my attr to 420,12bit, everything seems to work. This means kodi upscales 1080 material to 4k and the tv does some 2:3 pull-down magic if I’m not wrong. So this seems to work but is it right? Feels like something’s off 