List folk:

In the MWE below, everything builds cleanly if the \setupdelimitedtext 
line is removed. With it removed, however, quote marks protrusion looks 
poor when nearby quote marks in non-quotation text is allowed to 
protrude. The happens when there is a citation in a footnote in the 
quoted text.

Is this a bug, or simply something not yet ready with the new regime, or 
am I doing something wrong?

    % The next line should allow \startquotation to protrude quotes
    \setupdelimitedtext[quotation][method=font]
    % However, it causes the new bib code to fail when there is a
    %   footnote containing a citation in the quote. See
    % http://www.mail-archive.com/ntg-context@ntg.nl/msg35580.html
    \definefontfeature [default][protrusion=quality]
    \setupalign        [hz,hanging]
    \usebtxdataset     [xx.bib]
    \starttext
    \startparagraph\noindent
       There is a citation in the footnote to this standard
    paragraph\footnote{This footnote has a citation \cite[One].}
    \stopparagraph
    \startquotation[right]
       There is a citation in the footnote to this block
    quotation\footnote{This footnote has a citation \cite[Two].}
    \stopquotation
    \startparagraph\noindent
    “There is a citation in the footnote to this standard
    paragraph\footnote{This footnote has a citation \cite[One].}”
    \stopparagraph
    \placelistofpublications
    \stoptext

And the corresponding xx.bib file:

    @BOOK{One,
       author       = {A. N. Author},
       title        = {A Book Title},
       year         = {2017},
       publisher    = {Self},
       address      = {sine loco},
    }

    @ARTICLE{Two,
       author       = {N. O. Author},
       title        = {A Pipe},
       journal      = {The Journal},
       year         = {2018},
       volume       = {32},
       number       = {3},
       pages        = {42--69},
    }

-- 
Rik Kabel