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Maybe for you, this is how i solved it a few years back.

Anyway.
You know you get exalted after finishing the Mending Fences quest, right?
This doesn't mean you actually finished the questline....

If you haven't completed the questline make sure to pick up the last quests. For me it used to work when i had the sane problem.
Also try landing on the ground, this made it phase for me aswell.