New UI "Create" Button Freezes Sometimes

When you click the create button in the new create world UI, it takes a long time for the button to actually do something. I will hit the button multiple times, but nothing happens for a while. Then after several seconds, it will finally work. Watch the video to understand what I'm talking about.

 

Update: This seems to happen longer if you have a shader pack under resource packs for the world when you click create.