Unity often loses reference to UnityEngine.UI and more (using Assembly Definitions)

Unity Engine
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Hello, I’m using assembly definitions in my project, write code with JetBrains Rider, and Unity 2019.3.15f1
Pretty often when I save changes in Rider, go back to Unity and see a bunch of errors in the console, saying that UnityEngine.UI and some other assemblies wasn’t found. Why is that?

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Had the same problem, its annoying that you need to restart the unity and reload the project again.