Describe the bug

I discovered that autosave triggers even when there were no changes applied only for the published post. It works perfectly fine for drafts.

To Reproduce
Steps to reproduce the behavior:

1. Create a post (it isn't related to demo post only), write some content and publish it.
2. Reopen your published post.
3. Open network tab in your browser's developer tools.
4. Change something in one of the blocks.
5. Observer autosave being triggered after your changes were autosaved.

Expected behavior
Autosave is triggered only once after content in the published post has changed.

Screenshots

Desktop (please complete the following information):

• OS: macOS Mojave
• Browser: Chrome
• Version: 70