ARCore background contrast error in 4.20.2 vs 4.19.2

Hello Epic people, I am not very skeptical about you guys ability to answer my question, due to my inability to explain what is happening
Have a look at this image (4.19.2) good lookin image eh!

now have a look at this abomination 4.20.2

Now please explain what is happening here both are AR Sample project one is made in 19 and other in 20

Please help me to solve this , the AR app I am creating looks horrendous due to blurriness of background and wrong brightness and contrast.