Code blocks S->M are rendered incorrectly

Code blocks sent from Slack to Matrix are using different line breaks (`<br>`) than those sent from Matrix (from Element web/desktop) (`\n`). Message sent from Element:  Message received from Slack:  The formatted_body differs: Message sent from Element: ``` "formatted_body": "<pre><code>code block\nline 2\nline 3\n</code></pre>\n", ``` Message received from Slack: ``` "formatted_body": "<pre><code>code block slack-&gt;matrix<br/>line 2<br/>line 3</code></pre>", ```