As the title states, there is a problem with this extension: https://marketplace.visualstudio.com/items?itemName=ms-dotnettools.csharp
It appears that some snippets given by this extension along with .NET installed on my computer.
For example in a non initialized environment by running dotnet new (....)
This is what appears


sometimes there are snippets sometimes there are none.
However, when disabling or uninstalling this C# Snippets extension and keeping C# Microsoft extension the issue goes away and all the snippets appear when running dotnet...
There also seems to be about a 2-5 minutes gap upon installation or after uninstallation when the snippets error occurs.