I am having an issue where ships that are not currently the active vessel are not maintaining heading with SAS.
https://imgur.com/a/pZWRu
The ship that has my Kerbal is in atmo on Kerbin and detaches a probe. I switch focus to this probe, set SAS and set heading to be retrograde. This works great and the probe maintains a retrograde direction as it decends.
I switch focus back to the other ship and watch as the probe descends and I can see it start to tumble. I switch back to the probe and it has indeed started tumbling around, but now that it is the active vessel it regains a retrograde heading and maintains it as long as it is the active vessel. At any time if I switch back to the other ship the heading is again lost.
Is this a stock bug? I have several mods installed but nothing that I think could mess up heading and SAS controls. Has anyone else seen this?