keyPressEvent fails to register

The first time my application receives a keyPressEvent for a "4" key pressed in my keyboard, it registers it wrong. They QKeyEvent::key() should return 52, but it actually returns 126. QKeyEvent::text() returns "4" as expected.

This only happens for the first "4" I press, as the next inputs work as expected: key() returns 52 and text() returns "4".

I'm pretty sure this bug only happens on Windows (tested on 7 and XP), and not on GNU/Linux.

I'm attaching a minimal test case. I've tested it pressing keys 1, 2, 3, 4, 4 again, and 5.

Expected output:

49 "1"
50 "2"
51 "3"
52 "4"
52 "4"
53 "5"

Actual output:

49 "1"
50 "2"
51 "3"
126 "4"
52 "4"
53 "5"