@blacknell Hi! I have just replied to your email.
Generally, the default PowerBlock firmware does not return to the previous power state upon power loss. However, I did work on this feature some months ago and I built an updated firmware version for the PowerBlock that contains this feature: Upon switch on, the PowerBlock persists the ON state as target state. When in ON state and a power button switch off event is observed the OFF state is persisted as target state. When a power-reset event occurs the PowerBlock returns to the previously persisted target state.
If you have a programmer for the ATTiny85 microcontroller on the PowerBlock you could just download this other firmware.
I am happy to provide this firmware upon request. New batches of the PowerBlock might get this firmware per default, eventually.