[Facebook] Page Admin discloser in Event Cover Photo

 POC -

A Page Admin who used FB4A to create an Event and upload a Cover Photo to it had missing post attribution.

Admin's personal profile was shown instead of Page profile.

Timeline -

Reported - Saturday, July 7, 2018

Triaged - Wednesday, July 11, 2018

Fixed - Tuesday, July 31

Rewarded - Wednesday, August 8

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