bhyve: can't find /boot/entropy

I am trying to install a firewall appliance from stormshield [1]  using bhyve and vm-bhyve. They only support KVM so I had to first convert their qcow2 image to a raw image (vm-bhyve take care of it).  They don't have n UEFI boot so I'm using the default bhyve loader. But After the boot (started manually I get stuck to the message "can't find '/boot/entropy'".


```
Loading kernel...
/boot/kernel/kernel text=0x6de318 data=0x95f20+0x95a430 syms=[0x8+0xbdc18+0x8+0xbbc32]
Loading configured modules...
can't find '/boot/entropy'
Consoles: userboot

FreeBSD/amd64 User boot lua, Revision 1.2
Loading /boot/defaults/loader.conf
Loading /boot/loader.whitelist
Loading /boot/device.hints
Loading /boot/device.hints.sns
Loading /boot/loader.conf
Loading /boot/loader.conf.local
ERROR: /boot/lua/password.lua:127: attempt to call a nil value (field 'restrictInteractive').


Type '?' for a list of commands, 'help' for more detailed help.
OK ls
/
 d  .snap
 d  data
 d  boot
 d  libexec
    COPYRIGHT
 d  bin
 d  dev
 d  etc
 d  lib
 d  sbin
 d  tmp
 d  usr
 d  var
OK ls boot
boot
 d  kernel
    boot1.efi
    gptboot
    mbr
    loader.efi
    pmbr
    userboot.so
    loader
    boot
 d  lua
 d  defaults
    loader.whitelist
    device.hints
    manifest
    manifest.rcerts
    manifest.rsig
    pass_manifest
    pass_manifest.rcerts
    pass_manifest.rsig
OK boot
unknown command
OK boot
Loading kernel...
/boot/kernel/kernel text=0x6de318 data=0x95f20+0x95a430 syms=[0x8+0xbdc18+0x8+0xbbc32]
Loading configured modules...
can't find '/boot/entropy'
```


The vm-bhyve configuration is the following:

```
loader="bhyveload"
cpu=1
memory=2G
network0_type="virtio-net"
network0_switch="public"
disk0_type="virtio-blk"
disk0_name="disk0"
disk0_dev="sparse-zvol"
uuid="7aa0cad4-b4fc-11ec-898b-1402ec690a80"
network0_mac="58:9c:fc:04:33:de"
```

They are using a custom version of hardened bsd (freebsd 12.3 I think).  Any ide how this can be fixed? Using proxmox and latest KVM + seabios, the image boot with succcess. Any hint is welcome :)

Benoît