Cannot open C# scripts in 2020.1.0b6

I can open scripts well in 2019.3.11f1, but in 2020.1.0b6 I can’t open it even if I made a brand new project.

using Windows 10 64bit, and did nothing but installing Unity 2020.1.0b6 with Android Build Support.
Visual Studio 2019 was already installed, and I can open the scripts through the file inspector,
but it won’t provide a connection(auto-completion) with UnityEngine.
in Unity Preferences, External Tool is correctly set to Visual Studio 2019 (Community)

there’s no error on Console, it just doesn’t do anything

There’s already a thread about this topic:

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