`blockQuote/` 内的 `/pre/code`

错误
1

Whereas /pre/code produces:

<button class="btn nohighlight copy-cmd btn-flat" aria-label="copy code to clipboard">
<svg class="fa d-icon d-icon-copy svg-icon svg-string" aria-hidden="true" xmlns="http://www.w3.org/2000/svg">
<use href="#copy"></use>
</svg>
</button>

blockQuote/pre/code does not:

Context