Autocompletion issues with preprocessed templates

Here's something I noticed:

- Create any T4 preprocessed template, for instance:

```
<#@ template language="C#" #>
Hello!
```

- Run the "Preprocess Template" action


- Try to use it from C#:

```C#
var test = new Test();
test.TransformText();
```

- The IDE does not suggest `Test` in the autocompletion popup, but does suggest `TestBase`:


- The `TransformText` method is not present in the suggestions either:


- Go to definition does not work on the type or the method.

Tested with Rider 2020.1, with the bundled 2020.1.157 version of the plugin.