Blank VNC output with freebsd 13 qcow image

[nicolaspernoud]

Operating system

Ubuntu 22.04.5 LTS

Description

When trying to boot a freebsd qcow2, no vnc output is displayed.
The VNC connection seems to be working, but there is a blank screen (see screenshot).
The image is from https://download.freebsd.org/releases/VM-IMAGES/13.3-RELEASE/amd64/Latest/FreeBSD-13.3-RELEASE-amd64.qcow2.xz

Docker compose

services:
qemu:
container_name: qemu
image: qemux/qemu-docker
environment:
BOOT_MODE: "legacy"
DEBUG: "Y"
devices:
- /dev/kvm
cap_add:
- NET_ADMIN
volumes:
- ./FreeBSD-13.3-RELEASE-amd64.qcow2:/storage/data.qcow2
ports:
- 8006:8006
stop_grace_period: 2m

Docker log

SeaBIOS (version 1.16.3-debian-1.16.3-2)
qemu | Booting from Hard Disk...
qemu | -
qemu |

Screenshots (optional)