The dismiss new keyboard shortcut (x,r) has been broken since 7a79bd7da3e0a59454a3c03f3be31e457d0b9fcc. A fix was done and JS tests were added in 006d52f32b8d61449dcdd42fa09b06b1573091b0 and b01e4738abe206cd1d09db74acacc743c457c374 but the test was not quite correct and so the bottom dismiss new button was not clicked.
This also fixes an issue with our keyboard shortcut click handling. If multiple elements matched the selector they were all clicked. Now we just click the first match.