Pasting rich text causes new paragraphs for every line break

Using Ghost
1

I’m trying to copy some exiting rtf files onto Ghost. Simply copy/pasting of:

Test
Test
Test

results in:

<p data-koenig-dnd-droppable="true"><strong>Test</strong></p>
<p data-koenig-dnd-droppable="true"><strong>Test</strong></p>
<p data-koenig-dnd-droppable="true"><strong>Test</strong></p>

However, if I first convert the source to plaintext, then paste into Ghost, I get the much more reasonable:

<p data-koenig-dnd-droppable="true">
  Test
  <span class="-mobiledoc-kit__atom">‌<span contenteditable="false"><br></span>‌</span>
  Test
  <span class="-mobiledoc-kit__atom">‌<span contenteditable="false"><br></span>‌</span>
  Test
</p>

The problem is that I have other formatting (bold, italics) that needs to be preserved, so I can’t simply convert everything into plaintext before posting to Ghost. How can I get line breaks from rtf documents to behave?