I’m not sure if this is intentional, but it started happening a couple of days ago and it really bugs me and my colleagues, since we have to do a lot of copying & pasting within document tables:
When you copy a text within a cell, that consists of regular text and bulletpoints, you cannot paste it into another cell, without a new table being created, which results in nested tables.
When you copy and paste only bulletpoints or only regular text, it does not create a nested table.