CLI subscribe power missing state sometimes

I use the CLI to monitor the power state of my piCorePlayer to also power on/off the amplifier.
Recently, the subscribe power command has been returning 'power ' without the 1 or 0 but not always.
When this happens, my script now explicitly requests the power state using 'power ?' and this works properly.

Still I think there is a bug with either the subscribe command and/or the power parameter.

I'm running Logitech Media Server Version: 7.9.3 - 1597753178 @ Sun Aug 23 19:21:22 CEST 2020

Thanks,
Daniel