While in a world with ray-tracing enabled, the “upscaling” toggle in the video settings menu (which enables DLSS) does not function/remains grayed out. This occurs on the latest Nvidia drivers with the latest minecraft update, but, upscaling works correctly with a 40 series GPU on the same system. See here as well for someone else mentioning it: https://www.nvidia.com/en-us/geforce/forums/game-ready-driver/13/557663/minecraft-upscaling-grayed-out-for-rtx5090/
I know this is a sample size of two, but I can find no one else who seems to even be testing bedrock minecraft on the 50 series.
Closing as a duplicate of MCPE-190607.