I've not run into that and I do considerable pop editing. Will keep am eye out for this. I have a recurring problem with the sample object popping in at 0,0,0 when I have no 'landing pad' for it there; often in the middle of a building, but in my Escapist scene one turned up in the middle of the water and random seed will fix it temporarily but should I save and close the project that way it always comes back. Another reason that project is on the shelf.
EDIT
moved the pop from 0,0,0,to 100,0,0 and problem solved