Steps to reproduce:
Form a group of two avatars. Call them avatar A and avatar B
Deed a parcel to this group.
Have avatar A build something elaborate.
Later, have avatar A crash leaving behind a ghost on the parcel.
Pretend avatar B has the bright idea to Eject avatar A from the parcel to maybe knock him offline. Alternatively, pretend that avatar B ejects avatar A as a joke thinking that Eject simply teleports the subject home and has no side-effects. In any case, have avatar B eject avatar A for some reason.
Avatar A is ejected from the current parcel, AND every object owned by them is returned EVEN IF it is set to the group that owns the parcel. Avatar A will have to put the object back on the parcel and they will never be in the same places they once were. In other words, there is permanent damage.
Solution
1. Provide a warning of this unexpected behavior to person B (report potential side effects to the user) , or,
2. Do not return any objects that are set to the group or person who is the registered landowner of the parcel (filter the side effects), or
3. Do not return any objects as part of the Eject operation. (no side effects)