Scancode trouble

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Mr.Waterlily

I have big trouble getting the scancode of the "Alt Gr" button.
When I run this little program:

Open in online IDE

Repeat
   For testkey = 1 To 221
      If KeyHit(testkey)
         Print testkey
      End If
   Next
Forever

I get TWO scancodes for the "Alt Gr" button, 29 and 184.
And they come in no particular order.
Since 29 is the code for "Left Ctrl" there is clearly something wrong. Has anyone else got this problem?

Is this an issue with Blitz or my keyboard or something else?