[NTG-context] font error in float placement?

[Henning Hraban Ramm <texml@fiee.net>]

(LMTX, latest beta with self-compiled binary on OSX-intel.)

With my book, I run into an Lua error while placing a sidefloat.
If I comment \externalfigure or replace the image with a different one, 
the error disappears.

I can’t reproduce it in a minimal example, so I guess it depends on the 
current surroundings.

Since it points to some font handling and the figure is a PDF containing 
fonts, I guess it might depend on the new handling of fonts in PDFs, but 
it doesn’t change regardless of 
\setupexternalfigures[compact=preset:merge] or other settings.

Here’s the image:
https://yemaya.fiee.net/s/8TqwfcP7mLMmy9p
(In a simple document it works.)

Hraban

"""
lua error       > lua error on line 516 in file de/c_feinheiten.tex:

registered function call [1565]: 
...xmf-context/tex/context/base/mkxl/lpdf-fix-imp-fonts.lmt:596: attempt 
to index a nil value (field 'embed')
stack traceback:
	...xmf-context/tex/context/base/mkxl/lpdf-fix-imp-fonts.lmt:596: in 
local 'handler'
	...xmf-context/tex/context/base/mkxl/lpdf-fix-imp-fonts.lmt:709: in 
upvalue 'plugin'
	...xmf-context/tex/context/base/mkxl/lpdf-fix-imp-fonts.lmt:938: in 
upvalue 'lpdf_epdf_fontplugin'
	[string "local lpdf_epdf_fontplugin = lpdf.epdf.fontpl..."]:3: in local 
'runner'
	...-10/tex/texmf-context/tex/context/base/mkxl/lpdf-fix.lmt:97: in 
upvalue 'lpdf_epdf_contentplugin'
	[string "local lpdf_epdf_contentplugin = lpdf.epdf.con..."]:3: in local 
'runner'
	...-10/tex/texmf-context/tex/context/base/mkxl/lpdf-fix.lmt:119: in 
field 'pageplugin'
	...-10/tex/texmf-context/tex/context/base/mkxl/lpdf-pde.lmt:1371: in 
upvalue 'copypage'
	...-10/tex/texmf-context/tex/context/base/mkiv/grph-chk.lua:112: in 
function <...-10/tex/texmf-context/tex/context/base/mkiv/grph-chk.lua:97>
	...-10/tex/texmf-context/tex/context/base/mkxl/grph-inc.lmt:1680: in 
function <...-10/tex/texmf-context/tex/context/base/mkxl/grph-inc.lmt:1665>
	(...tail calls...)
506     \startsubsection[title=Schriftwahl]
…
513
514     \startplacefigure[title={Beispiele für gebrochene Schriften, 
halbherzig von Hand ausgeglichen},location=right,reference=abb:fraktur]
515     \externalfigure[gebrochene_schriften][width=.5\textwidth]
516 >>  \stopplacefigure
"""
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