Django Q&Q versus filter.filter

While hunting a bug, I found out that the following 2 statements do different things:

Query 1

Order.objects 
  .filter(items__name__icontains="Foo") 
  .filter(items__name__icontains="Bar") 
  .distinct()

Query 2

Order.objects 
  .filter(
    Q(items__name__icontains="Foo") &
    Q(items__name__icontains="Bar")
  ) 
  .distinct()

The result is as follows:

• Query 1 does include orders that have items which either contain "Foo" or "Bar". For example one item's name is "Foo" while another item's name is "Bar".
• Query 2 however only includes orders that have at least one item that contains all keywords, for example an item with a name of "Foo Bar".

Looking at the queries, I can see that the filter() method adds another INNER JOIN to the query while the other doesn't.

I can see the reasoning behind this, but I really wonder if that's the intended behavior.