Window furniture redraw issue with different width scrollbars

I have noticed the following difference between RISC OS 6 and RISC OS 5 regarding the drawing of window furniture. I have a theme that has scrollbars that are narrower than normal. The vertical scrollbar renders correctly on RISC OS 6 but on RISC OS 5 it starts too far to the left, thus causing a number of pixels (4 in this case) to not be drawn down the right side of the window.

The horizontal scrollbar is drawn correctly.

Not a huge issue, I can redesign the theme slightly, but I thought I’d raise it.