8 Bit Color Fill Wrong paletteIndex

I am having an issue with creating a mask on the fly in Director 11 on Windows.
This is an abridged version of my routine just to highlight the problem;
on Test me, v_width, v_height
myMask = image( v_width, v_height, 8, #grayscale )
myMask.fill( myMask.rect, [#shapeType: #roundRect, #color: color( 255, 255, 255 )] )
put myMask.getPixel( 100, 100 )
end Test
Basically if I make an image of 127 x 127 it sets a paletteIndex of 0 as expected, if I go over that and create an image of 128 x 128 it sets a paletteIndex of 168. It seems to only happen with the #roundRect shape. Any thoughts or suggestions? Can other people confirm this as a bug?

I can probably use a flood fill to correct the colour but I would still like to know if this is a bug or something I am doing wrong.
on Test me, v_width, v_height
myMask = image( v_width, v_height, 8, #grayscale )
myMask.fill( myMask.rect, [#shapeType: #roundRect, #color: color( 255, 255, 255 )] )
myMask.fill( point( v_width/ 2, v_height/ 2 ), color( 255, 255, 255 ) )
put myMask.getPixel( 100, 100 )
end Test

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I may not quite follow.
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8 Bit Color Fill Wrong paletteIndex

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