Kerbal Space Program

KSP 1.8.1 MH + BG

Using the attached save:

1. Retract the landing legs of any or all of the crafts
2. Change to a craft that doesn't have legs or doesn't have legs that are retracted
3. Go to the Tracking Station

Result:
Any of the crafts that had landing legs retracted will be destroyed

Look to the log file for the following:
[WRN 02:24:06.631] [F: 14089]: Vessel Large Landing Legs crashed through terrain on Ike.
[LOG 02:24:06.631] [Vessel Large Landing Legs]: Vessel was destroyed.
[WRN 02:24:06.631] [F: 14089]: Vessel Small Landing Legs crashed through terrain on Ike.
[LOG 02:24:06.631] [Vessel Small Landing Legs]: Vessel was destroyed.
[WRN 02:24:07.890] [F: 14212]: Vessel Medium Landing Legs crashed through terrain on Ike.
[LOG 02:24:07.890] [Vessel Medium Landing Legs]: Vessel was destroyed.

Reason:
KSP thinks that the crafts with landing legs retracted and in contact with the ground are in flight and not actually landed.

Additional Information:
In some situations I have loaded a quicksave with the landing legs retracted and the craft sinks into the ground