I have the following markdown I want to render
```
## Summary
This monorepo is a coordination layer over four independent implementations of the same problem set. Clojure defines the Clojure algorithmic source, and C#, Rust, and Elixir mirror that source in their own idioms. The container repo keeps the system organized through ZSH-based orchestration, documentation, and repo-wide conventions.
```
The word C# produce an error like
```
[X] Conversion error: ❌ Markdown Parsing Error: UnknownToken("Unexpected character at position 5426")
```
If I replace C# through CSharp it renders correctly
Also I would suggest to transform the position information 5426 to line:column format to detect the error faster in the input stream.
I suppose the Heading detections also seeks for # inside a paragraph.