Steps to reproduce:

1. Have a tab open with some content.
2. Open a new tab and verify that some input that matches the content in the target tab produces a suggestion with the tab switch button.
3. Copy the full URL of the target tab.
4. Open a new tab and paste the URL into the omnibox.
5. Note that a suggestion is offered matching the target tab but the tab switch button is not present.

A couple observations:
- The steps above will produce a url-what-you-typed suggestion but it's possible to get a non-wyt suggestion by removing one or more characters from the end of the URL and pasting that. Then you'll get a history match, but it still won't have the tab switch button.
- If you remove the scheme from the full URL and then paste that, you'll get a suggestion with the tab switch button present.

This might seem like a really obscure case to worry about but it's very easy to trigger currently if you focus the tab switch button and then press space. That will fill the full URL of the target tab into the omnibox, plus a space. If you try to fix your mistake by deleting the space, you'd like to have the suggestion return with the button but the button will be gone.