I just debugged and can confirm behaviour described in #13882
The label includes a URL like
http://demo.matomo.org/foo/bar and the label is then removed in the
ColumnCallbackReplace filter meaning there could be several entries with the same label and a group by is needed.
User confirmed it works, might cause the report to load a little less slow since the filters needed to be executed directly and the GroupBy is not the fastest either.