The huge creative inventory (or the recipe book catalog) used to drop items. But in 1.10.0, it doesn’t do that anymore.
When you tap the empty space to drop an item (as usual), the selector is gone (indicating the drop is registered) but nothing drops. The player’s inventory can drop items but the huge catalog doesn’t drop anything at all, as indicated in the video.
Steps to reproduce:
1- Select any item from the creative catalog.
2- Tap on the empty space in the lower section (to drop the item)
3- The marker disappears but nothing drops.
The video I have provided should explain everything.