Starburst character in the HP-41 TrueType font

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I am using the HP-41 LCD character font and cannot get the starburst (all segments on) character to display. How do I do it?

Looking with various font tools, in FontForge I can see it exists at position 255, but if I use that character in some example, it falls back to some standard font (showing 'y' with dots over it).

I am using SVG (scalable vector graphics) and try to show it in a web browser and convert it to pdf using Inkscape, same result.