I tried: 5.3-release-notes
Blockquote * Lumen Reflections support more than one bounce when hardware ray tracing (HWRT) is enabled with Hit Lighting, and the Max Reflection Bounces setting in the post process volume is set to 2 or greater. This can prevent black areas in reflections when there is enough performance budget to allow it.
But Lumen Ray bounces not working:
RT:
EDIT SOLVED:
+ Enable: Global Ilumation = Lumen