Affects 1.2.10

The bug occurs in the main menu, the rest aren't tested.

By MCPE Helper Auldrick:
Where clicks do occur, the click sound is delayed until after the next screen is shown. This is a trivial matter for most buttons because the next screen is shown quickly. However, for a few, such as Settings > Storage, Settings > Video > Fancy Leaves, and Settings > Video > Texel Anti-Aliasing, there is a noticeable delay before the screen is updated, and then the click happens afterward. This defeats the presumed intention of providing audible click confirmation.

Affects:
Main menu page: All buttons

Play page (worlds list): All buttons except the Import button (next to Create New)

Create... dialog: All buttons

Create New World page:

Game settings: Seed picker button (next to Seed text box)
Settings page: All Default Settings buttons, as well as the Continue and Go Back buttons on the confirmation dialog they open.

Profile Settings: "Manage who can send you invites", "Attribution", and "Licensed Content" buttons
Store main page: Skin Packs, Texture Packs, Worlds, and Mash-up Packs buttons. In the frame, the "+" button for purchasing Minecoins.
Pack details page: Ratings, "See more by", and unlock buttons.
Note: Most pack thumbnail buttons do not click, but I'm not sure if they're supposed to. The only thumbnail buttons I found that click are those at the top left of the Store main page.