pre code blocks are escaped automatically but code spans are not

[tivie]

Input:

<pre><code><span>foo</span></code></pre>

some more code <code><span>foo</span></code>

Expected output:

<pre><code>$lt;span$gt;foo$lt;/span$gt;</code></pre>

<p>some more code <code>$lt;span$gt;foo$lt;/span$gt;</code></p>

Actual output:

<pre><code>$lt;span$gt;foo$lt;/span$gt;</code></pre>

<p>some more code <code><span>foo</span></code></p>

Either none or both should be escaped