New JS SDK with OAuth 2.0 saving subdomain in fbsr_ cookie?

Question

EDIT: This bug was logged, and confirmed as a Facebook bug. It has now been fixed!

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I am testing my updates to move onto the new JS SDK. My app runs across mu

Answer 1

Update: The bug has been updated by Facebook to 'Fixed'. Hooray!

This is a facebook bug and has been logged, reproduced and accepted as high priority here: https://developers.facebook.com/bugs/256155664428653?browse=search_4e843e6d89a232275456793