Properties window is blank after installed latest .NET 5.0 SDK

[Amy-Li03]

• .NET Core Version:
  .NET 5.0.100-rc.2.20465.34

• More info:
  This is a regression issue, it cannot reproduce on .NET 5.0.100-rc.2.20464.22 build.
  

• Have you experienced this same bug with .NET Framework?:
  No

Problem description:
Properties window is blank, we cannot see any properties for form or added controls, and no properties and events toolbar in Properties window.

Expected behavior:
All properties and events are in Properties window.

Minimal repro:

1. Create a WinForms .Net Core application and change the targetFramework to .NET 5.0.
2. Focus on Form designer, and go to Properties window or press F4.
3. Observe Properties window.

[Amy-Li03]

@JeremyKuhne could you please investigate this regression issue?

[IrinaPykhova]

I also see that with RC2

[Amy-Li03]

Installed .net 5.0 rc2 from: https://github.com/dotnet/installer, the latest build is .NET 5.0.100-rc.2.20466.16, this issue doesn't repro on this build.

[kirsan31]

Yes it's working. But after first V.S. launch I was waiting far more than 30 seconds for properties to appear. I already started writing here that the fix didn't work for me. Went back to the studio and they showed up. In subsequent launches, properties appear within a couple of seconds ...