Phaser.Key.onDown listener issue

[Jazcash]

See this example: https://phaser.io/sandbox/edit/TZeowZWz

If you open the console and hold left, right, up, down and press space it logs "SPACE PRESSED".
If you hold up + right and press space it logs SPACE PRESSED, but not if you hold combinations of any of the other directions. What gives?

Edit: Nevermind, just found this: https://github.com/photonstorm/phaser/issues/949