pandoc 2.0.6-2.1.3 (incorrectly?) requires rst list-table body to be indented 3 spaces or more

[phlummox]

pandoc versions tried:

• pandoc 2.0.6, compiled with pandoc-types 1.17.3, texmath 0.10.1, skylighting 0.5.0.1
• pandoc 2.1.3, compiled with pandoc-types 1.17.4.2, texmath 0.10.1.1, skylighting 0.7.0.2

example (a.txt, list-table body indented 2 spaces):

.. list-table::
  :header-rows: 1
  
  * - Foo
    - Bar
  * - spam
    - ham

command run:

• pandoc -f rst -t html -o a.html a.txt

expected output:

<table>
<thead>
<tr class="header">
<th>Foo</th>
<th>Bar</th>
</tr>
</thead>
<tbody>
<tr class="odd">
<td>spam</td>
<td>ham</td>
</tr>
</tbody>
</table>

actual output (the body of the directive is interpreted as a block quote containing a definition list an a list):

<table>
<tbody>
</tbody>
</table>
<blockquote>
<dl>
<dt>header-rows</dt>
<dd><p>1</p>
</dd>
</dl>
<ul>
<li><ul>
<li>Foo</li>
<li>Bar</li>
</ul></li>
<li><ul>
<li>spam</li>
<li>ham</li>
</ul></li>
</ul>
</blockquote>

The rst file above has the body of the directive indented 2 spaces, and pandoc fails to parse it as a list-table. The rst specification says that the body of explicit markup blocks like this must be "indented relative to the first [line]", which it is, and rst2html parses it as a list-table. If the directive is indended 3 spaces or more, pandoc seems to parse the body correctly.