If I choose firmware UEFI x86_64: /usr/share/OVMF/OVMF_CODE_4M.secboot.fd at installation, then after installation, the system boot without problems. if, instead, I leave the default value - UEFI - then after instalation the system remains at grub prompt.
No other differences between the two installations using debian-trixie-DI-rc1-amd64-netinst.iso.