Bug with backslashes

When I have something like

namespace Test\{{pascalCase slug}}\FinalTest;

It does not work, the {{pascalCase slug}} still there without getting replaced!

But when I do it with double backslashes like:

namespace Test\\{{pascalCase slug}}\FinalTest;

It works.. it is a bit anoying to add a duplicated backslashes on each file for this, can you please fix that?