There seems to be an issue with 5.4.2 (not sure why there are no changelogs for 5.4.2) where searching doesn’t work unless you’ve typed at least 5 or 6 characters.
For example, tried searching “Harry” to find the Harry Potter movies but none were found until I typed “Harry Po”. Same with looking for the Twilight series. Had to type “twili” before any results were found. This is not an issue in the non-preview version of the app.