I've run into a bug with the Rhea command pod. It thinks it is a probe, even when there is crew present.
I ran out of power and lost total control of the Rhea, despite there being crew right there!
KSP ver 1.12.3.3173 (steam)
Near Future Spacecraft 1.4.3 installed from CKAN
I edited the part and replaced "minimumCrew = 0" with "minimumCrew = 1". Problem went away, now says "Full Crew Control" with the crew icon instead of the probe icon in the upper left.