ACF WSYIWIG Unknown Tag: <!-- wp:header -->

I am having an issue with the wysiwig field sometimes adding these strange tags/comments. I figure they are important, but in some cases they have an impact on the text formatting on the frontend. Here is an example of an issue i saw:

<!-- wp:header -->
<h1>Header Text</h1>
Some Text
<h1>Header Text</h1>
Some More Text
<!-- /wp:header --> 

on the frontend the line breaks and spacing seems to get stripped from the content, but removing the <!-- wp:header --> tag resolves this. What are these tags and are they even needed?

It appears that when the tag is removed, the editor wraps the elements in a p tag, but otherwise it does not.

before:

\r\nSome text\r\n
\r\n<strong>Some Text\r\n</strong>
More Text\r\n
\r\n<strong>Some Text\r\n</strong>
More Text\r\n

after:

<p>Some text</p>\n
<p>
<strong>Some Text</strong>
<br />\n
More Text</p>\n
<p>
<strong>Some Text</strong>
<br />\n
More Text</p>\n

Note: the tags/comments also aren't consistent. Sometimes they are added to the editor code, but other times they are not.

Start by reproducing the reported formatting in an ACF WYSIWYG field using the provided HTML examples, then compare the editor content with the frontend output. Determine when the wp:header comments are added and whether they change paragraph and line-break handling; done means the behavior is consistent and the intended rendered formatting is preserved.