Let me preface this by saying I am not sure if this is a bug or an intended interaction.
I am using the Void Knight mastery, and one of my skills is Void Cleave with the passive “Gravity’s Edge” which turns Void Cleave from a melee attack into a Traversal skill.
The passive bonus from Void Knight (the Echo portion at least), specifically excludes “movement abilities and Anomaly”, however I have noticed that my Void Cleave absolutely does Echo, though the Echo does not gain any of the extended range that my player character gets from Gravity’s Edge.
Cheers & thanks for all your hard work.