This issue is fixed for new video uploads! Creators, you're now good to upload/stream/premiere, as channel page, subs feed, and notifications are working as usual. See the Community post for more details about what went down → https://goo.gl/zyvCgC https://twitter.com/TeamYouTube/status/1088127086663888896 …
Thankfully i haven't dealt with this but i do know others who have. Glad that you've come forward with thia fix