When updating posts, the initial version is not saved as a revision.

[georgestephanis]

When you save a post, then update it, the initial version isn't saved.

This is often not seen, because when calling get_default_post_to_edit() with true as the second parameter, an empty post is created in the db, and that not being seen after the fact is hardly missed.

However, if wp_insert_post() is called directly, the initial content currently gets lost.

Unit test attached.

[georgestephanis]

Duplicate of #30854.