F# scripts in subdirectories fail to load the core library

[mrakgr]

To Reproduce

1. Make a directory like E:\F# Tests. Open it in VS Code. In VS Code, create test.fsx with the line let x = 1. This works.
2. Create a subdirectory qwe with the file asd.fsx and the line let x = 1. This gives the following error:
   

Environment (please complete the following information):

• VSCode version:
  Version: 1.51.1 (user setup)
  Commit: e5a624b788d92b8d34d1392e4c4d9789406efe8f
  Date: 2020-11-10T23:34:32.027Z
  Electron: 9.3.3
  Chrome: 83.0.4103.122
  Node.js: 12.14.1
  V8: 8.3.110.13-electron.0
  OS: Windows_NT x64 10.0.18363
• dotnet SDK version: Core 5.0.101 (installed the .NET SDK today)
• mono / .Net Framework version: Microsoft .NET Framework Version 4.8.03752 (from VS's About page)

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[Krzysztof-Cieslak]

To work on .NET 5 SDK correctly you need preview version of Ionide 5.0 (installation instructions here: #1305 (comment))

I can't reproduce this issue on the latest preview: