Diff issue in amendments with ordered/unordered lists

Describe the bug
Amendments in an ordered/unordered list result in an incorrect diff. If new content is entered at a lower level, the diff generates a new line. This is incorrect.

Amendment text:

Amendment output with wrong diff:

How to Reproduce

1. open motions
2. create a new motion with code 1 linked below.
3. create an amendment to it in line 1-5 with Code 2 linked below.
4. --> Error with wrong new line will appear.

Code 1:

	<li>Testzeile 1<ol>
	<li>Testzeile 2<ol>
	<li>Testzeile 3</li>
	<li>Testzeile 4</li>
</ol>
</li>
<li>Testzeile 5</li>
</ol>
</li>
<li>Testzeile 6</li>
</ol>

Code 2:

	<li>Testzeile 1<ol>
	<li>Testzeile 2<ol>
	<li>Testzeile 3 Mehr Inhalt</li>
	<li>Testzeile 4</li>
</ol>
</li>
<li>Testzeile 5</li>
</ol>
</li>
</ol>

Expected behavior
If an amendment if done to a lower level list point, the diff should work correctly.

Reproduce the issue in Motions by creating a motion with Code 1 and an amendment using Code 2, focusing on the nested ordered-list item. Inspect the amendment diff flow from that reproduction; done means adding lower-level list content produces the correct diff without an erroneous new line.