Not working input button spacebar, if press and hold buttons arrow!

Not working press spacebar, if press and hold buttons arrow!

  1. Press and hold the button right arrow + up arrow, and press the spacebar. Console to write a “Space”
  2. Press and hold the button left arrow + up arrow, and press the spacebar. Console NOT write a “Space”
  3. Press and hold the button left arrow + bottom arrow, and press the spacebar. Console NOT write a “Space”
  4. Press and hold the button right arrow + bottom arrow, and press the spacebar. Console NOT write a “Space”

Unity 5.5.0p4

script c#

void Update () {

if (Input.GetKeyDown(KeyCode.Space))
{
print(“Space”);
}
}

Something tells me this is a key matrix problem

Other keys work! On the other keyboard the same problem!

The problem is not in Unity! https://www.microsoft.com/appliedsciences/KeyboardGhostingDemo.mspx
Thread can be closed.