No image after booting LibreElec

Hardware:

NUC6CAYH PC with LibreElec 8.01 Generic installed
TV is a LG 49UH610V
Receiver is a Pioneer VRX-830

I get no video-image when I boot-up my NUC with LibreElec if my PC is connected to the receiver. I do get an image if I directly connect my NUC to the TV. Furthermore, when I installed Windows 10 on it I did get my screen working fine when the NUC was connected to the receiver.

I'm abit at a loss at what I can do. I imagine LibreElec is trying to set an unsupported resolution/refresh-rate or something when it is connected to the receiver, but I seem to unable to fix this.

Perhaps anyone has some pointers? I tried both the Generic LibreElec 8.01 and the one with HEVC265-10bit support with the 4.11 kernel. Neither gives a video-image on my setup. What gives? And more importantly, what can I do to resolve this strange situation.

Done:
aMRh
Screen 0: minimum 8 x 8, current 1920 x 1080, maximum 32767 x 32767

DP1 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 1600mm x 900mm
3840x2160 60.00 + 30.00 25.00 24.00 29.97 23.98
4096x2160 24.00 23.98
1920x1080 60.00 50.00* 59.94 30.00 25.00 24.00 29.97 23.98
1920x1080i 60.00 50.00 59.94
1280x1024 60.02
1360x768 60.02
1152x864 59.97
1280x720 60.00 50.00 59.94
1024x768 60.00
800x600 60.32
720x576 50.00
720x480 60.00 59.94
640x480 60.00 59.94
720x400 70.08
DP2 disconnected (normal left inverted right x axis y axis)
VIRTUAL1 disconnected (normal left inverted right x axis y axis)

I manually set the resolution during the test to 1920x1080. I generally run the Kodi GUI in 1920x1080p so that Kodi doesn't upscale everything to 4K (Kodi up-scaler sucks compared to what the TV does, imo).

However, when connected to the TV it can also run on 4K no problem. I just set it to 1920x1080p (which I want to do when connected "through" the receiver too).

Do you have recommendations in how to fix this? Or do you need more information ?

With the Pioneer in the loop I get:
LPEIScreen 0: minimum 8 x 8, current 3840 x 2160, maximum 32767 x 32767
DP1 connected primary 3840x2160+0+0 (normal left inverted right x axis y axis) 1600mm x 900mm
3840x2160 60.00*+ 30.00 25.00 24.00 29.97 23.98
4096x2160 24.00 23.98
1920x1080 60.00 50.00 59.94 30.00 25.00 24.00 29.97 23.98
1920x1080i 60.00 50.00 59.94
1280x1024 60.02
1360x768 60.02
1152x864 59.97
1280x720 60.00 50.00 59.94
1024x768 60.00
800x600 60.32
720x576 50.00
720x480 60.00 59.94
640x480 60.00 59.94
720x400 70.08
DP2 disconnected (normal left inverted right x axis y axis)
VIRTUAL1 disconnected (normal left inverted right x axis y axis)

and with this I get no image.

I did learn that if I set Kodi to 1920x1080p 60 Hz. with it directly connected to my TV and then switch the NUC to the HDMI on the receiver I get an image.

So it is somehow that the resolution set by Kodi during boot-up is not supported by my receiver for whatever reason. I guess I have to fix KODI to 1920x1080p but I noticed it has a tendency to reset occassionally... ugh