Trying to run a virtual machine with Gnome Boxes on Fedora 37 always starts with QEMU boot error

I tried to run Gnome OS, Fedora Silverblue and endeavourOS with Gnome Boxes (Flathub install) on Fedora 37. However, regardless of system, booting into the virtual machine immediately stops with: The steps I took were pretty default: 1. Install Gnome Boxes via Flathub 2. Open Gnome Boxes and choose 'Create Virtual Machine' 3. Install GnomeOS Nightly (2nd time Fedora Silverblue) from pre-configured source 4. Start Virtual Machine If I check my virtualization capabilities, everything looks fine:

$ gnome-boxes --checks
• The CPU is capable of virtualization: yes
• The KVM module is loaded: yes
• Libvirt KVM guest available: yes
• Boxes storage pool available: yes
• The SELinux context is default: yes

The image are at the right place and accessible to libvirt: $ virsh list ; virsh vol-list gnome-boxes Id Name Status ------------------------------ 1 gnomenightly laufend Name Pfad -------------------------------------------------------------------------------- gnomenightly /home/firestarter/.local/share/gnome-boxes/images/gnomenightly The QEMU logs show some warnings of qemu-system-x86_64: warning: This family of AMD CPU doesn't support hyperthreading(2) (I have a AMD Ryzen 5 5500U). However, this should not be a problem here as far as my research have told me. UPDATE: So it appears, that it relates to the default uefi boot modus of Gnome OS and Fedora Silverblue. Trying another image, Manjaro, which offers me the option to boot in BIOS the virtual machine boots. Using UEFI option for the same image, the boot fails as before; although edk2-ovmf is installed.