Latest LMTX, probably an error in mkxl/s-fonts-show.mkxl:
\starttext
\showbodyfont
\showbodyfontenvironment % error!
As you can see, the font class is called \quotation{\fontclass} and the
bodyfont is typeset from \quotation{\fontname\font} in
\the\globalbodyfontsize.
\stoptext
Hraban
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