Our camper-van microwave has the analog knobs that can be set to temp and time. It will restart after a power interruption at whatever the settings were before the power went off. We evidently bumped the timing knob once during pack-up and, at the next hook-up, we found it running after I connected to shore power.
Now we check it every single time.....
I've never heard of a digital or touch-pad microwave restarting that way. I may have to double-check ours in the 139 just to be sure.