Wrong resolution on each (cold)boot

I own a Odroid N2 and loving it so far…

I do have an issue at this point with this device. Each time the N2 (cold)boots CoreElec it has not set the correct resolution.

I turn the N2 on (put in powerplug) and after that the TV turn’s on correctly with HDMI-CEC. But then it has a weird stretched 720P resolution. Each time I have to re-set the below settings to get a good screen setup and reboot the N2. With a reboot (warm-boot?) the settings do not get affected to the weird 720P resolution.

I set up the following in Kodi:

Screen:
Whitelist: 3840x2160p 60Hz
Resolution: 3840x2160p
Hertz:60Hz

CoreELEC:
Disable noise reduction: off
Tone map SDR to HDR: off
Tone map HDR to SDR: off
Limit display colour depth to 8-bit: off
Use 4:2:2 colour subsampling: on
Disable GUI scaling: on
Enable HEVC seek workaround: on (to make Hyperion-ng work)

CoreElec:
9.2.1

TV:
LG OLED55B6

Extra software installed on system:
Hyperion-ng (because regular Hyperion does not work).

Anybody an idea what the issue could be? I’m kind off leaning to a boot resolution setting that is not set?

looks same trouble than here: https://discourse.coreelec.org/t/how-to-force-gui-resolution/5439
I don’t know if there is a way to wait the screen on, before CE boot and choose resolution