Weird sporadic issue with Disasmo

Sometimes when I open up VS anew and want to disassemble the method I can encounter this strange exception:
```
System.ArgumentException: The path is not of a legal form.
at System.IO.Path.NormalizePath(String path, Boolean fullCheck, Int32 maxPathLength, Boolean expandShortPaths)
at System.IO.Path.InternalGetDirectoryName(String path)
at Disasmo.MainViewModel.d__80.MoveNext()
```
It fixes up itself eventually but I don't understand how I get to see this problem self-fixed at all and I have no clear reasoning what's wrong about it.
BTW I have tried to try this with local dotnet/runtime build, turned all the switches on/off but it still doesn't work