Certain actions aren't canceled after opening game mode switcher

The bug

The follow actions aren't cancelled after the gamemode switcher is opened:

• Blocking with a shield
• Preparing to shoot with a bow/crossbow
• Prepearing to throw a trident
• Eating/drinking food item
• Using a spyglass
  (List may be incomplete)

You can let go of the right-click button on their mouse, causing the player to stay in that current action unless a gamemode has been chosen.

To reproduce

1. Have a shield and hold right-click
2. Do F3 + F4, do not pick a gamemode yet
   → Your player is stuck in that action, and you can let go of the right-click button and observer that you are still blocking

   Video

   Minecraft 1.16.1 - Singleplayer 2020-07-04 13-58-49.mp4