<p>I learned something new today. Apparently the tag wiki pages have default syntax highlighting setting on the bottom and we used the default one for the  <code>[r]</code> tag (for Python it is correct).</p>
<p>Now it's fixed.</p>
<p><a href="https://i.stack.imgur.com/Ph2KO.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Ph2KO.png" alt="enter image description here" /></a></p>
<p>Alternatively, remember that you can always use</p>
<pre><code>&lt;!-- lang-all: lang-r --&gt;
</code></pre>
<p>somewhere in the body of the post to set highlighting for all snippets, or start the snippet with</p>
<pre><code>```lang-r
</code></pre>
