MVC Razor: Accepting an auto complete that requires new a new using generates garbage

[StringEpsilon]

Given:

Then hit tab:

This happens on pretty much any given .cshtml file with any code completion that would add a using in regular C#.

Notably: This can also overwrite existing code / markup in that file.

Found while testing the latest preview version of https://github.com/dotnet/vscode-csharp (v2.26.13 (pre-release)). I sadly do not know which version of the razor tooling that corresponds to or how to find out.