I got this week an LG C4 and I noticed that the HDR mode is displayed with 8 bit instead of 10 bit while using Kodi. Could someone with an LG OLED test it? Press the green button of the LG remote 7 times and the info of the current mode, resolution, frame rate and somehing like this will appear:
YCBR422 8b TM HDR10
With the Amazon app and the same content I get YCBR422 10b TM HDR10 so the only explanation must be that it happens because of Kodi.