Hanging on boot after update unstable nixpkgs last week

Last week after updating nixpkgs-unstable, my system hangs after systemd-boot entry menu, no messages on the console, and I use a custom latest 7.3.1 kernel, The same kernel config workd with nixpkgs-26.05. How can I debug this problem, I enable systemd debug on the kernel boot parameter, but It doesn’t work, still empty log message after the systemd-boot entry menu.