try to handle nested phantom

required/latex-lab/math-tagging-issues/phantom.tex

@@ -27,14 +27,19 @@
   \else
     \expandafter\makeph@nt
   \fi}
-
 \cs_set:Npn \mathph@nt #1 #2 {%
  %
   \setbox \z@ = \hbox {
     $
     \m@th
     #1
-    {\SuspendTagging{phantom}#2}
+    {% nested phantoms should not be tagged and annotated to avoid
+    % Package tagpdf Warning: structure with label 20 has already been used
+    % and faulty structure
+    % is suppressing annotation the right thing?
+    \SuspendTagging{phantom}
+    \luamml_annotate:en{core=false}{#2}}
+    % save
     \luamml_save:nNn {mathphant} #1 {mphantom}
     $
   } 
@@ -59,9 +64,8 @@
 
 abc $x_1^2 \mathstrut_1^2 \vphantom{\int}_1^2  $
 
-%$ \vphantom{x\mathstrut} $ gives
-% Package tagpdf Warning: structure with label 20 has already been used
-% and faulty structure
+abc $ \vphantom{x\mathstrut}_1^2 $ 
 
+abc $ x\hphantom{x\mathstrut}_1^2 $ 
 
-\end{document}
+\end{document}