At the delete of the related object the relation is not correctly deleted

Steps to reproduce

1.Create object with atribute object relations list (for example list1) and add to list two articles (for example 1 and 2)
2.Edit article 2 and add related object list1 to it.
3.Delete object list1 to trash.
4.Browse article and we can see that related object [1] but an object is not displayed
5.Empty trash – the same result.
6.Expected related objects [0]