[luatex] Why does LuaTeX show the middle dot instead of ano teleia?

[Heiko Oberdiek via luatex]

Hello,

using LuaTeX to review the glyphs of a font, I discovered an oddity 
about U+0387 ANO TELEIA. LuaTeX shows U+00B7 MIDDLE DOT instead.
Minimal example (the font does not matter, if it contains both glyphs
that are different in some way, e.g. shape or position):
    \documentclass{standalone}
    \usepackage{fontspec}
    \newfontface\TestFont{FreeSans.ttf}
    \begin{document}
        \TestFont
        \symbol{"00B7}% MIDDLE DOT
        \symbol{"0387}% ANO TELEIA
    \end{document}

The bounding boxes of the glyphs can be retrieved with FontForge:

    #!/usr/bin/env fontforge

    import fontforge

    font = fontforge.open('FreeSans.ttf')
    print(f'U+00B7: {font[0x00B7].boundingBox()}')
    print(f'U+0387: {font[0x0387].boundingBox()}')

The result:

    U+00B7: (87.0, 227.0, 191.0, 331.0)
    U+0387: (86.0, 420.0, 190.0, 524.0)

The vertical positions of the dots are quite different with
U+0387 at a higher position.

* But LuaTeX  1.16.0 (TeX Live 2023/Cygwin) with
  development id 7567 shows the middle dot in both cases.
* XeTeX 3.141592653-2.6-0.999995 (TeX Live 2023/Cygwin)
  shows the expected result where U+0387 is shown at a
  higher vertical position.

Yours sincerely
  Heiko