Media Library search only searches viewed pages of content

Expected behavior

If I have previously scrolled through multiple pages of photos in my media library, whenever I perform a search in the media library I would expect to find matching images within those pages that I've already browsed.

Actual behavior

If I have previously scrolled through multiple pages of photos in my media library, and then I leave and re-enter the Media section of the app or access site media from elsewhere (like setting a Featured Image), only the first page of photos is searched when I perform a search.

I presume we cache the metadata for the pages of images that we've viewed, but upon re-accessing the Media library only the first page is loaded in unless you scroll.

Steps to reproduce the behavior

• Choose a site and go to Media
• Scroll down so that 3 or so pages of media are loaded
• Select an image and give it a title
• Search for that title, see that the image is shown
• Leave the Media section, and then go back in
• Perform the same search. See that the image you used previously isn't displayed
• Scroll down to find the image, and search again. The image will show up in the search results.
• The same happens if you now navigate somewhere like Post Settings > Featured Image > Media Library

Tested on Samsung s10e, Android 10, WPAndroid alpha-250

Start by reproducing the search flow in the Media section after browsing several pages, leaving and re-entering it, and opening Media Library through Post Settings > Featured Image. Compare results before and after scrolling additional pages. Done means previously viewed matching media remains searchable when the Media Library is reopened or accessed from Featured Image.