The Bug:
You cannot hold the TAB key to navigate between buttons quickly in the "Data Packs" menu.
Steps to Reproduce:
Navigate to the singleplayer menu.
Click on the "Create New World" button.
Hold down the TAB key and take note of how you rapidly switch between the selection of buttons.
Click on the "Data Packs" button.
Hold down the TAB key and observe the selection of buttons closely.
Take note as to whether or not you can hold the TAB key to navigate between buttons quickly in the "Data Packs" menu.
Observed Behavior:
You cannot hold the TAB key to navigate between buttons quickly.
Expected Behavior:
You would be able to hold the TAB key to navigate between buttons quickly, just like how you're able to in most other menus.
I can reproduce in 1.17.1