Content written against doenetML 0.6 causes low level error

[jaltekruse]

This content was written against the version of DoenetML currently in production on the doenet.org site. Trying to render it with the tip of the DoenetML repo here, the in-progress 0.7 version gives the internal error "Cannot read properties of undefined (reading 'componentName')"

          <setup>
     <select name="slope">-4 -2 2 4</select>
     <select name="vertex_y">-4 -3 -2 -1 0 1 2 3 4</select>
 </setup>

 <p>Sketch the derivative of <m>y=<math>$slope/2*x^2+$vertex_y</math></m></p>

 <graph aspectRatio="1" xmin="-10" xmax='10' ymin='-10' ymax='10' grid>

     <function name='f' variables='x'>$slope/2*x^2+$vertex_y</function>

     <point name="p1" stylenumber="2" x="-1" y='3'>
         <constraints><attractToGrid /></constraints>
     </point>

     <point name="p2" stylenumber="2" x="0" y='3'>
         <constraints><attractToGrid /></constraints>
     </point>

     <point name="p3" stylenumber="2" x="1" y='3'>
         <constraints><attractToGrid /></constraints>
     </point>

     <parabola name="deriv" through="$p1 $p2 $p3" stylenumber="2"/>

 </graph>

 <answer>
     <award>
         <when>
 ($p1.y-$p2.y)/($p1.x-$p2.x) = $slope and 
 ($p1.y-$p2.y)/($p1.x-$p2.x)*$p1.x-$p1.y = 0 and 

 ($p1.y-$p3.y)/($p1.x-$p3.x) = $slope and 
 ($p1.y-$p3.y)/($p1.x-$p3.x)*$p1.x-$p1.y = 0 and 

 ($p3.y-$p2.y)/($p3.x-$p2.x) = $slope and 
 ($p3.y-$p2.y)/($p3.x-$p2.x)*$p2.x-$p2.y = 0 
         </when>
     </award>
 </answer>

[dqnykamp]

Here's something closer to a MWE that exhibits same flaw:

<select name="slope">1 2</select>

<answer>
  <award>
    <when>
      $slope = 2
    </when>
  </award>
</answer>