Input suggestions shows same file name for search block

I want to add a class to input field for search block. When i check the file name suggestions to the input field using twig debug,i get two suggestion with same filename input--search.html.twig

<!-- FILE NAME SUGGESTIONS:
   * input--search.html.twig
   x input--form-control.html.twig
   * input--search.html.twig
   * input.html.twig
-->

Shouldn't the first file suggestion have id or something added to it?