The following from Boeing manual: (535-E4 engines)
"Each engine EEC is powered by dual dedicated generators."
And
"The inop light is illuminated when the EEC is turned off or a failure is detected in the system."
Ditto for ELC.
It sounds like a sim bug, but I suppose it is possible that the circuitry for the inop lights might be affected by a total AC failure. The chances of eight dedicated generators failing simultaneously must be one of life's remoter possibilities!
I'm not going to try it on the aircraft tomorrow anyway.