Type hover does not work properly for wildcards in in tuple patterns

```fs
type T = int * float
let f ((x,_) : T) = ()
```

When I hover over the `_` the tooltip I get back is `val _arg1 : T`. I thought this might be because the VS version is a few months out of date, but even on the latest (non-review) one the error persists.

* Operating system - Win 10
* .NET Runtime kind (.NET Core, .NET Framework, Mono) - Microsoft .NET Framework Version 4.8.03752
* Editing Tools (e.g. Visual Studio Version, Visual Studio) - Microsoft Visual Studio Community 2019 Version 16.7.5