props.target on links are always new

If i have this
config:
```
Markdown.configure({
a: ({ children, href, title, target }) => {
console.log(target);
return {children}
},
});
```
and having this in my code
```

target is always "new" no matter what the markdown is

Reproduce the issue with the Markdown.configure link renderer and the example markdown shown in the report. Trace how the link's target value is produced, then verify that it reflects the markdown input rather than always being "new"; add or update coverage if the repository provides a relevant test entry point.

Written by the indexing model from the issue text.