[NTG-context] Why are ConTeXt-SBL endnotes empty?

[Joel via ntg-context <ntg-context@ntg.nl>]

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A few years back, I tried using endnotes with ConTeXt-SBL, and it failed to compile. I'm forced to try again (due to some other issue with footnotes), and instead of compiling to error, it compiles, but the footnote's message ends up being empty. 
Why is it appearing empty? Is there a fix?

Here is a minimum working example:
\usemodule[publ-imp-sbl]
\startbuffer [bib]

@Article{na2006,
title={Volcanoes \word{of} New Mexico},
year={2006},
journal={New Mexico Earth Matters},
publisher={New Mexico Bureau \word{of} Geology \word{and} Mineral Resources},
volume={6},
number={1},
location={Socorro, New Mexico}
}

@Book{clark1989,
author = {Clark, William},
title = {Railroads \word{and} railroad towns \word{in} New Mexico},
publisher = {New Mexico Magazine},
year = {1989},
address = {Albuquerque, New Mexico},
isbn = {9780937206126}
}

\stopbuffer

\usebtxdataset[bib.buffer]

\setupbtx[dataset=default]
\usebtxdefinitions[sbl]
\setupbtx[sbl]

\setupnote[footnote][location=none]

\starttext

   \input knuth
    \cite[clark1989]

    \placenotes[footnote]

    
    \startchapter[title=Bibliography]
        \placelistofpublications
    \stopchapter

\stoptext

--Joel



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