Nested Grid Tags Break?

Is there a way to have nested grid fields within eachother from the same channel entry? I am trying to compare a multi-select list value to see if it relates to another field.

{exp:channel:entries channel="data"}
 {grid_field_a}
  {grid_field_b}
    {if grid_field_a:field_1 == grid_field_b:field_1}
     Match found
   {/if}
  {/grid_field_b}
 {/grid_field_a}
{/exp:channel:entries}

If you do the above without the conditional and just add the standard tag pairs to display values, it renders Grid Field B’s value, but the tags show as broken for Grid Field A

{grid_field_a}
 Grid Field B value renders here
{/grid_field_a}