Returning true from keyboard event does not block input

[ABCRic]

The wiki says this about the keyboard event:

Triggers on any keyboard action, including release of a button. Optionally returns a bool indicating whether or not the keyboard action has been caught. If true, it will not be passed on to the next stage, so the keyboard action would never reach the game.

With the following code loaded as an addon:

require('luau')
windower.register_event('keyboard', function(dik, down)
    if dik == 44 then
        log('z')
        return true
    end
end)

pressing Z will cause the message "z" to be printed, but the key is not blocked from reaching the game. It will still toggle run/walk mode for the player character. Also tested with W (17) and F (33) for walking and activating the log window respectively.