For what I understand, it depends also how much entities you have around you. If the area is cluttered, less important entities are removed first.nah. if you try and dump of stuff all at once in one location you can only drop like 10 or 15 things before they start disappearing. i've tried.
not sure how the trash cans are full. maybe they only hold 10 things. maybe they dont get cleaned up if players arent doing it all at once.