reboot hesitation on Pi3 running -current

A Pi3 running -current has taken to pausing during a shutdown -r in a strange way:
It gets to: 

Hit [Enter] to boot immediately, or any other key for command prompt.
Booting [/boot/kernel/kernel] in 5 second more detailed help.

It then stops at the OK prompt:

OK boot <---typing boot fails:
 
unknown command <---this looks strange, the kernel should already be loaded 
OK boot kernel <---specifying kernel makes something happy 
Loading kernel...
/boot/kernel/kernel text=0x2a8 text=0x95edb0 text=0x2a875c data=0x15acc8 data=0x0+0x37a000 syms=[0x8+0x158f88+0x8+0x182eee]

The boot then proceeds as usual.

No idea if this is significant, but it is somewhat odd.

Thanks for reading,

bob prohaska