HTML error with the multi-level list in Classic Editor

[yasglobal]

I have recently created a multi-level list which is throwing HTML validation error:
No p element in scope but a p end tag seen.
This error appears when there is some text between the multi-level list as shown here:
Please create a blog post and past these lines there and validate html.

<h3>DEMO 1:</h3>
<ol>
 	<li>Item 1</li>
 	<li>item 2
This text is the cause of generating the HTML error in ol.
<ul>
 	<li>test of list 1</li>
</ul>
</li>
</ol>

[yasglobal]

<h3>DEMO 1:</h3>
<ol>
 	<li>Item 1</li>
 	<li>item 2
This text is the cause of generating the HTML error in ol.
<ul>
 	<li>test of list 1</li>
</ul>
</li>
</ol>