Cannot press AVM2 buttons with keyboard

[n0samu]

Describe the bug

#16281 implemented pressing buttons with the Enter and Spacebar keys, but this only seems to work for AVM1 content. This might be because the PR only touched avm1_button, not avm2_button. For example, tabbing between the buttons on Not To Scale's Level Select screen works, and pressing Enter/Spacebar does have a visual effect, but the button's action does not occur. (For example, the mute button doesn't mute the audio, and the credits button doesn't show the credits screen.)

Expected behavior

Pressing the Enter or Spacebar keys when tabbed onto a button should cause the button's click action to occur, just as it does in AVM1 content.

Content Location

Page URL: https://www.newgrounds.com/portal/view/575849/
SWF URL: https://uploads.ungrounded.net/575000/575849_image_puzzle_ng.swf

Affected platform

Self-hosted version

Operating system

Windows 10

Browser

Firefox 134

Additional information

Also occurs on desktop.
For an example of AVM1 content where keyboard control works properly, try Prizma Puzzle Challenges