win32k: Ahk: ControlClick fails to click control

Created an attachment (id=7809)
Test case (binary and AHK source)

r56702 - works
r56703 - does not work
There is ControlClick.exe in attachment. When you run it, it will run MsgBox.exe, wait 3 seconds until 'MsgBox.exe' window appears, then sleep for a second and AHK ControlClick function will hit Button1 (Yes). Works in Windows, but fails in ReactOS. Debug log says: 'ControlClick' function did not report any error, but it did not hit Button1 either.