"Find in page" will only show a result if it is visible on the page (even though the scrollbar indicates the full vault has loaded, and even after scrolling down to the desired result and then back up).

They have a "Search vault" field that works fine, so it's not a major inconvenience, but the first few times I've Ctrl+F'd a newly added site and gotten "Phrase not found" when I know I added credentials? That's a mild anxiety I'd rather not have.

I could be convinced there's a security-related reason for this---in fact, I never really thought about it until now---but then I'd assume anyone able to get access to your vault can use Selenium and fill in the "Search vault" input field.