Zendesk UI broken after update

The recent Zendesk UI update broke how paragraphs are displayed in tickets created through the API.

We use the Zendesk API to create and add comments to tickets. The user creates the text using Markdown, which is then translated to the code below:

<p>Hello, user</p>
<p>This is a paragraph in the ticket. </p>
<p>Good bye</p>

This code is sent to Zendesk through the API.

However, if we look at the ticket in Zendesk, it is displayed as:

Hello, user
This is a paragraph in the ticket.
Good bye

Instead of the previous:

Hello, user

This is a paragraph in the ticket.

Good bye

This wasn't a problem until you guys updated the UI a couple of months ago.