Kerbal Space Program

I see a similar issue when entering a spaceplane that's parked on Kerbin (not spawning a new craft, but returning to it from the Tracking Station or directly from the Space Center) - the landing gear (small aircraft landing gear) bounce slightly, and only taking off and landing seems to reset them. In my case, it is not reproducing 100% of the time, maybe closer to 30% of the time.

The issue might be more general: it seems that stresses in construction are reset on docking when the model is probably rebuilt (pipes or winch connection using KAS plugin do the same) which causes sometimes "launching" entire base into the sky (on Minmus) if it stands on struts. It's less dangerous when struts were removed and the base lays just on tanks. Similarly, the likes to jump when it enters the physics range. When stress state isn't saved, also reloading while atmospheric flight causes quite violent stress resolving - while I didn't notice plane destruction, the smooth flight is disturbed in such case (so I never do quick save during final approach)

Now I see that version 1.3.1 does save the compressed state of landing legs and gear, while version 1.4.5 does not.

1.3.1 quicksave.sfs records ModuleWheelSuspension : suspensionPos = (0, 0, 0.44) where the final number gets larger with less weight, more extension.
1.4.5 quicksave.sfs records ModuleWheelSuspension : suspensionPos = (-1, -1, -1)

So I can imagine that upon docking the physics engine is told that the leg was fully compressed, then 0.02 seconds later is extended to whatever is needed to reach the ground, interprets that as something pulling the landing leg at some tens of m/s, and generated a damping force that pulls the craft rapidly down.