User not found and RSS breakage
Currently it seems that a lot of instances are getting this error thrown. This is affecting the RSS feeds as well. Tweets are visible if you directly link to them, as is all of the related content like images and video, but going to the profile page doesn't work. Testing between public instances yields differing results on what profiles work and which do not. I've completely flattened my docker image and deleted all content, rolling back a version to see if it was unique to the latest commit. It seems if the profile is not cached already it will not be found.

![image](https://user-images.githubusercontent.com/46979341/117919062-597da600-b2ba-11eb-917c-d827487b0c88.png)
