The 'PlayerInteractEvent' does not fire if all of the following is true:

1. The player is in adventure mode
2. The player left clicks
3. The player has a block in front of them

I would expect the event to fire with an action value of LEFT_CLICK_BLOCK, which is the case if the player is in survival mode.

Other notes:

• The event fires for LEFT_CLICK_AIR in adventure mode
• Paper can fire the event for LEFT_CLICK_BLOCK in adventure mode

This may be intended behavior but it feels incorrect, so feel free to tell me "no".

Provided a sample plugin that sets your gamemode to adventure and listens for the PlayerInteractEvent so you can verify that punching a block in adventure mode does not trigger the PlayerInteractEvent. Switch back to survival mode and you can see that punching a block does not trigger the event.