Using Busybox poweroff/reboot never properly shuts down the system

[PureTryOut]

I've just got a minimal Alpine system booting with dinit (using these service files) and it seems to work great. However the system fails to properly shutdown/reboot when using the Busybox command for it the last thing printed to the console is "Issuing shutdown via kernel..." but then hangs there forever. dinit-shutdown as provided by dinit itself in the Alpine packaging works fine however and according to the logs does basically the same thing, so I'm not sure what the difference is.