Segment with condition "does not contain" shows wrong for Page URLs

Following steps:

I create a segment that should not contain “umfagen” keyword in the URL:

I select the segment and open the visit log. I contains no entries with url and this keyword (good).

I select Behavior > Pages and it shows “umfragen” url right in the list (bad):

When I click on “open segmented visitor log” for “umfragen” page url, I get:

“There is no data for this report.”

The questions is: Is this just a bug in the page overview of does the filtering of the segment data fail at some point?

PS: I would have loved to upload more screenshot but there are some annoying restrictions for new users.