Gonzalo We’ve got this fixed in the development version of our in-progress filtering change. We’ll get an update out with the new filtering system in the next day or two, hopefully.
The problem is that it is matching for items with no date, anywhere in the tree. So if it has a parent with no date, it’s considered a match. But it should actually function like -date:any and hide items that have any date. So for now you can use -date:anyto do this.
