Adding youtube URL in the videoblock. Shows the following code:

<figure class="wp-block-video aligncenter"><video controls="" src="https://youtu.be/OJfOsoUYPts"></video>
	<figcaption>iPhone X – does it still worth 1k?</figcaption>
</figure>

After insertion, both backend and frontend looks like this:

And obviously doesn't work. Doesn't load.

Tried to insert both versions of the embeddable URL, youtube.com one and youtu.be one. Same output.

Using underscores theme from Automattic, with no code modifications. It is Gutenber 3.0.1. Running on MAMP Pro, on a Mac, regular setup, nothing wrong with the DE.