Gutenberg wraps Div->A->Div with P

[ludenb]

After Gutenberg 4.1 was released, it wraps <div> containig <a> containing <div> with <p> and duplicates <a> without <div> into one more <p>. There is no such a problem in Gutenberg 4.0

To Reproduce

1. Create a Custom HTML block with this HTML: <div><a style="height:50px;width: 100px;background: #ddd;display: block;border-radius: 10px;"><div>Test link</div></a></div>
2. Save and view the page
3. You will see
   

Expected behavior

Desktop (please complete the following information):

• OS: Win7
• Browser Chrome
• Version 69.0.3497.100

[collinanderson]

I'm also having an issue with custom html getting wrapped in <p>s that just started this morning with 4.1.0.

my post content has: (simplified)

<!-- wp:html -->
<a>
<div>
<h2></h2>
<p><span></span></p>
</div>
</a>
<!-- /wp:html -->

i'm getting this output:

<p><a></p>
<div>
<h2></h2>
<p><span></span></p>
</div>
<p></a></p>

[youknowriad]

It should be fixed by #11050