With Bookworm, Pi 4 and 5 now use Wayland (and WayVNC server) by default. Pi 3 and earlier still use X11 (and RealVNC server).
RealVNC client won't connect to WayVNC server, so the RPi developers are recommending TigerVNC client instead.
If you really want to keep using RealVNC client, you can reconfigure your Pi to use X11 (as baltika_no_9 has done). But this only works with x64 right now, x32 is broken due to a separate RealVNC bug.
See here for details: https://www.raspberrypi.com/news/bookwor...rry-pi-os/
RealVNC client won't connect to WayVNC server, so the RPi developers are recommending TigerVNC client instead.
If you really want to keep using RealVNC client, you can reconfigure your Pi to use X11 (as baltika_no_9 has done). But this only works with x64 right now, x32 is broken due to a separate RealVNC bug.
See here for details: https://www.raspberrypi.com/news/bookwor...rry-pi-os/