Fsharp non-deterministically fails to download vswhere

[ViktorHofer]

I saw this failure couple times in the past. The recent VMR build failed because of it.

Downloading vswhere
  Stream was not readable.
  System.ArgumentException: Stream was not readable.
     at System.IO.StreamReader..ctor(Stream stream, Encoding encoding, Boolean detectEncodingFromByteOrderMarks, Int32 bufferSize, Boolean leaveOpen)
     at System.IO.StreamReader..ctor(Stream stream, Encoding encoding)
     at Microsoft.PowerShell.Commands.FileSystemContentReaderWriter.CreateStreams(String filePath, String streamName, FileMode fileMode, FileAccess fileAccess, FileShare fileShare, Encoding fileEncoding)
     at Microsoft.PowerShell.Commands.FileSystemProvider.GetContentWriter(String path)
  at EnablePreviewSdks, D:\a\_work\1\s\src\fsharp\eng\build.ps1: line 517
  at <ScriptBlock>, D:\a\_work\1\s\src\fsharp\eng\build.ps1: line 544
  at <ScriptBlock>, <No file>: line 1
  at <ScriptBlock>, <No file>: line 1
##[error](NETCORE_ENGINEERING_TELEMETRY=Build) Failure preparing build

https://dev.azure.com/dnceng/internal/_build/results?buildId=2676220&view=logs&j=89eea50f-59b5-5921-c3ce-ce40b36fa819&t=483e1309-93e4-5a7a-74de-93b8d658274f

[ViktorHofer]

The max retry count is set to 5 which should be OK: https://github.com/dotnet/fsharp/blob/dc01094ebe2c04a7f466b5ac74c63dd6d9df2eb0/eng/common/tools.ps1#L236C33-L236C44

[majocha]

Locked output file?

[vzarytovskii]

It should be using arcade script, I think? Wonder what could be different from everything else.