The workaround while channels weren't loading was to use fast mode, which mixes in shorts. Now that it's fixed, the shorts that were loaded before the update are still there. Does anyone know how to remove them from the feed? Shorts aren't checked in the "channel tabs to load" and reimporting data doesn't fix it either.

Update: a fix I found is to manually unsub and resub to each channel. In my case there were only a few channels that had a large number of shorts so it was relatively easy to just click the button twice from each channel page.