Bracketed autolink `<...>` in markdown is detected twice

For example, `a.md`:
```
<http://127.0.0.1:8000/>
```

leads to
```console
$ cargo run -- a.md -vvv 
   [200] http://127.0.0.1:8000/ (at 1:2)
   [200] http://127.0.0.1:8000/ (at 1:2)
🔍 2 Total (in 9ms) 🔗 1 Unique ✅ 2 OK 🚫 0 Errors
```

Maybe this is being returned by both the markdown extractor and the plaintext linkify extractor?