Text and code blocks under spoiler

I'm trying to ask a question and put additional information under the spoiler. The best solution I've found looks like this:

>!Text block>!>!<pre><code>>!code block>!</code></pre>>!>!Text block>!>!<pre><code>>!code block>!</code></pre>>!>!Text block

Which results in:

Is it a bug? How can I hide the second and third "Text block"?