When an extension had features tied to money transactions, e.g. gifted subs, and that extension has been admitted broken by the developer then do not allow the developer to continue to operate the extension until it is fixed.

Bungie admitted on its support twitter back in mid-December that the extension was broken and even though they claim to have corrected the problem, the extension still doesn't properly work and their own support department stopped taking support tickets on the topic shortly after the fix. Almost 10 weeks of no solution or workaround as of writing (Feb 18).

For situations like this I believe Twitch should step in and force a developer to remove their extension until it is fully functional.