Hyperion.ng signal problem

I have a rpi4 with ws2801 leds. 21 on the left and right side and 38 up and down.

When I install hyperion.ng with this link;

And I make my configuration for the leds I got problems with my hyperion. In kodi itself there is no issue but when I open movie with 1080p I get directly the message on my tv;

No signal.

If I install hyperion classic with hypercon.jar and making json files, I could watch 1080p movies.

Could someone help me to fix this issue??

Well when I connect the rpi4 to full hd tv the internal grabber is working. But on 4k tv the internal grabber does not work.

Will this fixed in hyperion.ng?