Tried a 32 bit base install of debian on the raspberry Pi 4. I have the same results. i have a Fedora install on a laptop with CubicSDR 0.2.7 amd it works correctly. Both my RaspberryPi and my Debian Workstation have the modem waterfall issue after installing Bookworm. Same results using a SDRPlay RSP2 and a HackRF clone.
Thanks, Brian