[Bug 290549] console disappears after entering single-user mode

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=290549

            Bug ID: 290549
           Summary: console disappears after entering single-user mode
           Product: Base System
           Version: 15.0-CURRENT
          Hardware: arm64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: bhyve
          Assignee: virtualization@FreeBSD.org
          Reporter: dch@freebsd.org

## system

EFI boot arm64 VM at netcup.com running either 14.3-RELEASE or 15.0-BETA3
(fresh install)

kenv snippets:

efi_com_port="0"
efi_com_speed="38400"
efi_max_resolution="1x1"
efi-version="2.70"
smbios.bios.vendor="netcup"
smbios.bios.version="VPS 1000 ARM G11"
smbios.chassis.maker="QEMU"
smbios.chassis.version="virt-9.2"
smbios.entry_point_type="v3 (64-bit)"
smbios.processor.version="virt-9.2"
smbios.system.family="v2202501207540307083"
smbios.system.maker="netcup"
smbios.system.product="KVM Server"

## normal boot

- both beastie & loader prompt are visible & usable
- a normal boot has the console working all the way through

## single user boot via beastie menu

- console startup is fine until switching console
- last output is "Dual Console: Video Primary, Serial Secondary"
- after that we lose both input and console output
- but it still responds to ctrl-alt-delete
- and shows "Waiting (max 60 seconds) for system process `vnlru` to stop...
done, ditto for syncer, and the final `Syncing disks... ` line

## what we tried

- all available combinations of serial/video consoles
- loading virtio console drivers prior at loader prompt

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