It’s also worth noting that Hagrid’s Magical Creatures Motorbike Adventure is a very elaborate ride.
Keeping an attraction like that running takes some real work, so Universal has started opening the ride midday to limit the number of unexpected delays and to help the process run a bit more smoothly than is has previously.
Just plan on spending the morning getting everything else out of the way, and maybe have someone keep an eye on the line to see when it opens if you’re planning a trip!