Facebook breaks custom page tabs with security change, no response for month

By enabling a Content Security Policy limiting iframe sources, Facebook has broken all custom page tabs.<p>Bug reports have gone unanswered for a month.<p>https:&#x2F;&#x2F;developers.facebook.com&#x2F;support&#x2F;bugs&#x2F;593062641823417&#x2F;<p>https:&#x2F;&#x2F;developers.facebook.com&#x2F;support&#x2F;bugs&#x2F;268717971719721&#x2F;