Xbox Series X Black Screens When Changing Hz

I really thought that the new april update would provide 50 Hz support for the blu-ray player app but 50 Hz still doesn't work properly on my console. If I change the video settings to 50 Hz then the screen goes black for a short moment and I am asked if
I would like to keep these settings. Until here everything works fine. When I look into the settings of my TV, the input signal is at 50 Hz. But when I press "yes" (in order to keep the new console settings), then the screen goes black again and the input
signal changes back to 60 Hz.

I also have to say that I never really had a problem while watching a blu-ray; but everytime I insert a DVD there is this really strong and unacceptable jerking (doesn't matter which DVD, none of mine works properly).

I recently found out that it is a composite/s-video cable. How do I do then? Because when I set the Hz on the Xbox 360 and on my TV to 50-Hz, it shows up correctly, but when I set it to 60-Hz (which WWE SmackDown vs. RAW 2011 supports) it starts tp flicker,
and I get this "black bar/line" across the screen.

HDMI 2.0 only supports 1440p60 or 1080p120.
If you want a higher resolution with 120fps, you'll need a HDMI 2.1 cable.

Your Series S also supports 4k with up to 120fps, just like the Series X.

You can find more info here Set up 4K gaming at 120 Hz on Xbox Series X | Xbox Support when you expand the "Enable 120 Hz without 4K" Tab.

Same issue here bought a bluray disk was so excited to watch it on my Lg C1 using my Xbox series X! 20 minutes into the movie black screen with sound and nothing I do fixes it unless I disable the 24 hz mode which puts the colour down to 8 bit this is absolutely unacceptable why has this not been fixed yet?

I purchased this console because it had a bluray player now I’m thinking of returning it!

no samsung 4k tv has 140 hz, probably 120hz, but that game aint gonna get nowhere near 120fps on the x so will be struggling to hit 40fps therefore screen tear. try changing refresh rate on x to 60hz and try.