I found an issue with Scenario Outline matching for the newest version of Xunit 2.3.x (i did not check 2.2.x).
which does not exist in 2.1.x version.

There is different way how the test name is stored in xunit report.xml file:
version 2.1.0 vs 2.3.1

As you could see there is different encoding for the " characters : " for the older versions and " for the newer versions

Pickles reports for xunit results 2.1.0 are pretty fine:

unfortunately for the 2.3.x are not really good: