textgreek command unknown with LuaLaTeX since last babel-greek update

Question

Since the last babel-greek package update (around 2020-11-10), the textgreek command is no longer defined while compiling with LuaLaTeX. The following MWE:
documentclass{minimal}
usepackage[greek.ancient,french]{babel}
begin{document}
foreignlanguage{greek}{textgreek{da'imwn}}
end{document}

produces, while compiling with LuaLaTeX:
! Undefined control sequence.
<argument> textgreek 
           {da'imwn}

Though it worked fine before the babel-greek update (and works fine with the package reverted to the previous version) but it still compiles fine with pdfLaTeX and the latest version of babel-greek:

How can I get textgreek to work with LuaLaTeX and the latest version of babel-greek?

Ulrike Fischer · Accepted Answer

greek no longer loads LGR if it detects an unicode engine. But you can do it yourself:
documentclass{article}
usepackage[LGR,TU]{fontenc}
usepackage[greek.ancient,french]{babel}
begin{document}
foreignlanguage{greek}{textgreek{da'imwn}}
end{document}

Davislor · Answer

You can still load the LGR encoding with luainputenc and define textgreek to run fontencoding{LGR}selectfont.  This will hopelessly confuse the hyphenation patterns, however.  It will only work if you declare 8-bit LGR fonts with the same family names as your Unicode fonts, for example by loading substitutefont and declaring substitutefont{LGR}{rmdefault}{Tempora-TLF}, or by loading setmainfont{TeX Gyre Termes}[NFSSFamily=Tempora-TLF].
You asked about LuaLaTeX, but XeTeX gives you the option of defining a font mapping.  Your question inspired me to make one up for beta code, a more standardized way to encode Greek in ASCII, which currently is supported only for PDFTeX with betababel.

textgreek command unknown with LuaLaTeX since last babel-greek update

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