Let's assume that some adversary is out there keeping track of these planes, and knows that they can scan Google maps for the RGB artifact by the engines to locate them reliably and programmatically.
Now Google maps becomes a repository for information that adversary may use to validate other information. Maybe this confirms the schedule for some training excersise. Maybe this particular B2 being in this location validates or invalidates other information about US troop strength abroad.
I was taught to always "assume your adversary is capable of going through your trash" and try to prepare my "trash" accordingly.