Using setmathfont six or more times, in combination with "text-style" mathematics causes fatal error

[nilsjor]

This one really baffled be. In my attempt to isolate the error I made this minimal NOT-working example:

\documentclass{report}

\usepackage[%,
  % mathrm=sym,% Uncomment one of these lines to fix it
  % mathsf=sym,%
  ]{unicode-math}

\begin{document}

\setmathfont{Garamond Math}[Scale = MatchAveragecase]
\setmathfont{Garamond Math}[Scale = MatchUppercase, range = {bb, bbit}, StylisticSet=1]
\setmathfont{Kp Math}[Scale = MatchUppercase, range = {scr,bfscr}]
$\mathsf{NP}$ % Alternatively, comment this line out; or *any* of the subsequent setmathfont

\setmathfont{STIX Two Math}[range={"02AF4}, Scale=1] % \interleave
\setmathfont{STIX Two Math}[range={"02AFD}, Scale=0.8] % \sslash
\setmathfont{STIX Two Math}[range={"027C5}, Scale=1] % \lbag
$\mathrm{KL}$ % Or comment this line out...

\setmathfont{STIX Two Math}[range={"027C6}, Scale=1] % \rbag

Testing \(x \interleave y\), \(p \sslash q\), and the multiset bag-notation \(\lbag a, b \rbag\).

\end{document}

If this is compiled as-is, it causes the following fatal error:

No file minimal.aux.
Runaway argument?
10@nil try@load@fontshape expandafter ifx csname curr@fontshape endcsname ETC.
./minimal.tex:23: Paragraph ended before split@name was complete.
<to be read again> 
                   par 
l.24 
     
 733 words of node memory still in use:
   12 hlist, 1 vlist, 2 rule, 2 local_par, 1 dir, 6 math, 9 glue, 4 kern, 2 penalty, 7 glyph, 17 attribute, 52 glue_spec, 17 attribute_list, 2 if_stack, 1 write nodes
   avail lists: 2:5,3:3,4:1,5:7,7:2,8:4
./minimal.tex:24:  ==> Fatal error occurred, no output PDF file produced!
Transcript written on minimal.log.

minimal.log excerpt:

Package fontspec Info: 
(fontspec)             STIX Two Math scale = 1.

\sym__um_fam6=\mathgroup9
LaTeX Font Info:    Overwriting symbol font `__um_fam6' in version `normal'
(Font)                  TU/STIXTwoMath(0)/m/n --> TU/STIXTwoMath(0)/m/n on input line 22.
LaTeX Font Info:    Overwriting symbol font `__um_fam6' in version `bold'
(Font)                  TU/STIXTwoMath(0)/m/n --> TU/STIXTwoMath(0)/b/n on input line 22.
Runaway argument?
10@nil try@load@fontshape expandafter ifx csname curr@fontshape endcsname ETC.
./minimal.tex:23: Paragraph ended before split@name was complete.
<to be read again> 
                   par 
l.23 
     

Tested with LuaLaTeX

[u-fischer]

why are you doing all these \setmathfonts in the text body? If I move them to the preamble everything works fine.

[nilsjor]

It's a good question. I am using it to write a tutorial-style text on how to use unicode-math for students with previous latex experience. The point is to load glyphs selectively in the text to typeset a few variations and comment on the difference. The setmathfonts command typically works in the body text, so I was surprised when this strange interaction (using mathsf in this case) causes this weird error