[Bug]: Tmlanguage seems broken when using template arguments

[timotheeguerin]

Describe the bug

Using named template argument break the tm language for next statement

Reproduction

paste this in a tsp codeblock in markdown document in vscode(if you just do it in a regular typespec document the semantic highlighting will fix it)

op test1 is Some<Parameters={}>;
op test1 is Some<Parameters={}>;

highlight to

![image](https://github.com/microsoft/typespec/assets/1031227/d3a9068e-d446-4217-835a-bb3396844e6d)

Checklist

• Follow our Code of Conduct
• Check that there isn't already an issue that request the same bug to avoid creating a duplicate.
• Check that this is a concrete bug. For Q&A open a GitHub Discussion.
• The provided reproduction is a minimal reproducible example of the bug.