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Place down an inserter and a chest for it to take parts from.
Inserter is blinking it needs power.
Apply power to inserter.
Blinking about needing power goes away.
Remove power, inserter does not blink
Remove chest
Inserter now start blinking

Essentially sleeping inserters do not wake on removal of power providing poles. (Tested with distribution stations, fast belts, steel chest and fast inserters)

I'd imagine this is because sleeping inserters don't require any power

Further testing has shown that smart inserters that only have a filter go to sleep at train stations and don't wake up. Not sure how to recreate this but the setup I have is.

Train Stop
Engine + 1 Car train
5 smart inserters / side of the car
Back two smart inserters stopped inserting items after awhile. Rotating them woke them up and they started working again. I don't believe they ever lost power.

TL;DR fixed for 0.11.16

The error was not the lack of the electricity, as it is drained even when the entity is deactivated. The problem is that there was logic to not show the icon for deactivated entities (to avoid lot of blinking in the tight spot scenario for example). But the manually deactivated flag is now different, and the check was checking the automated deactivation ...