Distorted Reflection not work in UE5.1

Hi, i make a simple material to check the distorted reflection BUT in UE4 it work, in UE5.1
328281578_718365729904740_4848188639763237834_n
328045518_3326502477571811_8656891123208001372_n
not. They are same material. Can someone tell me what is this problem? Thanks

Your refraction value (50) is too high. It’s causing it to attempt to sample a pixel that is off screen. Since it’s impossible to sample a pixel off screen, it’ll just show the undistorted image instead. Most transparent materials have IoR values below 2.