I noticed this when using my browser's autocomplete to load the media search URL. It autocompleted to a link that included the `q=searchterm` parameter. The page loaded with image results — but the entire page was non responsive, as if the Javascript didn't load properly. Clicking images loaded their page in Commons, and it wasn't possible to click into the search input box.
Steps to reproduce:
1. Click on a link to `Special:MediaSearch` that already has a query. Example: https://commons.wikimedia.org/wiki/Special:MediaSearch?type=bitmap&q=puppy
2. Let the page load
3. Try to interact with the search input, or any of the search results
Expected: Same dynamic behavior (overlay popup / change of search terms) as when the page loads without an initial search.
Actual behavior: The input is non-responsive, no overlay popup (clicking on a result sends the browser to the page in commons)