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I raised an issue on Hipparchus forge because with version Hipparchus 1.7-SNAPSHOT some tests were failing in Orekit.
These tests are the testRetrogradeOrbit tests in classes CircularOrbit and KeplerianOrbit; as well as in the "fielded" versions of these classes.

See the Hipparchus issue here.
@luc found out that the issue actually comes from the way these tests are done in Orekit.
He suggests to change the test cases using a more adapted Z velocity component as a way to ensure stable behavior with a "nearly" equatorial retrograde orbit.
Which is, I think, a good idea, and should be done.
See the Hipparchus issue for more details.