Core Dump when Generating Proxmox VMA using nixos-generator

I’m currently trying to deploy a VM on a Proxmox server using NixOS.

As recommended in the wiki, I attempted to build a .vma file using nixos-generators, but it always fails with a core dump.

While debugging, I came across this well-documented GitHub project with a minimal example. However, it fails for me in the same way:

git clone https://github.com/liberodark/nixos-deploy && cd nixos-deploy
nix run github:nix-community/nixos-generators -- --format proxmox \
                  --configuration vm-config.nix
       last 25 log lines:
       > starting stage 2 (/nix/store/jhsb8pg2wk04fcqmv7qqdw0m29r4cjd2-vm-run-stage2)
       > tune2fs 1.47.1 (20-May-2024)
       > Setting maximal mount count to -1
       > Setting interval between checks to 0 seconds
       > Setting time filesystem last checked to Thu Jan 30 20:00:09 2025
       >
       > setting up /etc...
       > updating GRUB 2 menu...
       > installing the GRUB 2 boot loader on /dev/vda...
       > Installing for i386-pc platform.
       > Installation finished. No error reported.
       > tune2fs 1.47.1 (20-May-2024)
       > Setting maximal mount count to -1
       > Setting interval between checks to 0 seconds
       > Setting time filesystem last checked to Thu Jan 30 20:00:10 2025
       >
       > tune2fs 1.47.1 (20-May-2024)
       > Setting time filesystem last checked to Thu Jan  1 00:00:00 1970
       >
       > [    4.067218] reboot: Power down
       > [2025-01-30T20:00:13Z INFO  virtiofsd] Client disconnected, shutting down
       > [2025-01-30T20:00:13Z INFO  virtiofsd] Client disconnected, shutting down
       > vma: warning: vma_writer_close failed vma_queue_write: write error - Invalid argument
       > vma: creating vma archive failed
       > /nix/store/7m4wb1fndpi74pabqqgjiw3fqlbv03ki-vm-run: line 65:  1892 Trace/breakpoint trap   (core dumped) /nix/store/cz6zvwivmkg5rkqq5zxaclwfl16pj7vp-qemu-host-cpu-only-9.0.0/bin/vma create "vzdump-qemu-nixos-25.05pre-git.vma" -c /nix/store/1wqfhmdn7hggsicznkj8163chs40y91y-qemu-server.conf/qemu-server.conf drive-virtio0=$diskImage
       For full logs, run 'nix log /nix/store/i1466yc1zb0sf681gx6lg5ff9n59wbqh-proxmox-nixos-25.05pre-git.drv'.

Does anyone have an idea what might be causing this?

Just tried it on a different machine, there it is working.