unable to start isapc emulated - No 'PCI' bus found for device 'virtio-serial-pci'

[xp5-org]

Describe the issue
after upgrading from UTM 4.1.5 to 4.2.5, none of my newly created or previously created ISAPC based emulated VMs could power on, receiving the following error
QEMU exited from an error: qemu-i386-softmmu: -device virtio-serial: No 'PCI' bus found for device 'virtio-serial-pci'

i do not have virtio-serial configured or any serial devices added, although i can see "virtio-serial" (but not virtio-serial-pci) in the start command

Configuration

• UTM Version: Version 4.2.5 (81)
• macOS Version: 13.2 (22D49)
• Mac Chip (Intel, M1, ...): M1

Crash log
N/A no crash

Debug log
no debug log available, VM fails to start
VM Config:
config.plist.txt

Start command:
command.txt

this error can be seen on any newly created ISAPC vm on M1 mac