I don't know if this is the best topic for such an info, but unless we are talking about working and not working addons, I decided to write it down here:
I encountered behavior of XR-2, which can be considered a BUG (and it probably concerns all XR vessels): the vessel may be landed and fully stopped with parking brakes, but after the sim is restarted, the ground speed is not zero again, thus external cooling is switched off immediately.
1. It can lead to overheating all XR vessels which are stationed with retracted radiators.
2. It can make XR vessels to drive away from their stations (it depends of inclination of the surface they are landed on, but my tests showed that very little inclination will be enough).