Pasting in sub-list removes space after formatting in parent list

[TimAtVolgistics]

When pasting in a sub-list, spaces after a formatted word in the parent list get removed. For example:

<ol>
  <li>On the <strong>PAGENAME</strong> page:
    <ul>
	  <li>Choose PASTED_TEXT</li>
	  <li>other steps</li>
	</ul>
  </li>
  <li>more steps</li>
</ol>

When I paste the pasted text, the space after PAGENAME is removed. If I instead put the space inside the <strong> area, then it is not removed when pasting. This only happens when using nested lists.

This has been happening for a long time. We're currently on version 4.4, but this can be easily replicated on the editor demo page: