Hi Conejo,
Yes i definitely installed 2.3, clean install, wampserver localhost, new empty database.
then immediately i installed spanish and german language, there was a warning that there was a problem with spanish but it seems to work fine.
then i made 1 category and 1 subcategory
then i created 1 item and i noticed 3 items exactly the same in the new items list on the homepage
Also that the parent directory was selectable when it was set not to be, but when i tried to post to parent it said not possible as it should.