wpPost.content creates empty p-tags between paragraphs

[mayumih387]

Thank you for the great plugin!

WP Gatsby 2.1.1
WP GraphQL 1.6.10
WordPress 5.8.2

As the subject, wpPost.content inserts empty p-tags between normal paragraphs for all posts;

<p></p>
<p>this is the 1st paragraph.</p>
<p></p>
<p>this is the 2nd paragraph.</p>
<p></p>
<p>this is the last paragraph.</p>
<p></p>

my react code is:
<div className="content" dangerouslySetInnerHTML={{__html:data.wpPost.content}} />

When a post is updated with code editor mode, those <p></p>s disappear from that post. But once a new build/develop runs, they appear again.

Can this problem be solved just by my side or would it be a bug?
(those empty p-tags don't effect frontend view, but annoying...)