Replace text inside code block (complex) 400 Error

[Songyu-Wang]

Hello,
I have this block:

And I am trying to replace the content with the edit_document() function

old string: <pre class="prettyprint" id="OcCACAd67Ie"><a href="http://w=66&amp;projectKey">https://bCH<br/> akhasdkhasdkdhas (Does not work here)<br/>akhasdkhasdkdhasakhasdkhasdkdhasakhasdkhasdkdhas</a></pre>

new string: <pre class="prettyprint" id="OcCACAd67Ie"><a href="http://w=66&amp;projectKey">123<br/> akhasdkhasdkdhas (Does not work here)<br/>akhasdkhasdkdhasakhasdkhasdkdhasakhasdkhasdkdhas</a></pre>

And I got QuipError: 400: Only one section allowed for replacement
As far as I can tell, there is only one section which is the OcCACAd67Ie. I am not sure how can I get this to work