X-ray did show, maybe... ... Hmmmm.
From the film, does it look like its emanating from the facial insert or perhaps higher up on the tubercle representing Abductor digiti minimi or perhaps even Flexor digitorum brevis... ...
Any chance they're "in stance" view films too. Did they X-RAY whilst the foot was weight loaded or unloaded?
Have you had an diagnostic Ultrasound, cheap as chips too.
If its a tear, how substantive is that tear? Where in the fascia did it fail- the enthesis, the belly, the med/ lat chord- where?
So something has fatigued the fascia into tearing.
The fasia's in a stalemate of acute injury and now becoming chronic.
What's changed and perhaps hasn't changed in your history.
What's overloaded the fascia?
Structural, functional, restorative, footwear, training regime, recovery, medically...
Insoles or orthotics, there's a difference in correcting the foot posture. Or was it just an insole to mange impact?
Correct stretching technique, there's a difference between good and bad technique. Stretching of tendo Achilles is very beneficial but typically poorly done.
I'm all about accurate diagnosis, treatment can then be realistically guided rather guessed, compare precision guided munitions now to WW2. Sure area bombing was considered a success if it was within 5 miles of the target, but really...