Visual Studio editor project (Assembly-CSharp-Editor) no longer recognizes types in non-editor scripts (Assembly-CSharp)

After upgrading to Unity 2020.2.0a9 and then downgrading to 2019.3.12f1 things got messed up in visual studio (both in visual studio 2019 & 2017 community edition). My editor scripts (in Assembly-CSharp-Editor) are no longer able to reference objects in regular scripts residing in Assembly-CSHarp. The code still compiles fine in the unity editor, but not in visual studio. I no longer have access to intellisense and the visual studio is flooded with errors that makes it hard to work with. What is going on? ![Visual Studio Errors][1] [1]: https://i.imgur.com/7CdJXWE.png