In the meantime, as a temporary solution, in AbandonedBases.cs, you can add this
else if (entity is DroppedItemContainer)
{
Interface.CallHook("OnEntityEnteredAbandonedBase", new object[] { entity, center, radius, AllowPVP });
}
at the end of the "private void OnTriggerEnter(Collider collider)" method(line ~990), approximately at line 1055.
And in RealPVE.cs, before private void ForceCompleteBedMission(BasePlayer player), 53 line, add this
void OnEntityEnteredAbandonedBase(BaseEntity entity)
{
if (entity is DroppedItemContainer)
entity.OwnerID = 0uL;
}