Reproduction

1. Have a book with 2 versions, V1 and V2
2. Create a versioned page for V1
3. Select V2, which will display the inherited content of V1
4. Edit the page, modify it and save it

Result

The modifications apply to the V1 content.

Expectations

The modifications apply to a new V2 content, automatically created as a copy of the inherited content page.

Explanation/workaround

Currently, when displaying inherited content, the page displayed is the original page (so V1 content in the current example). Editing the page the edits the original.
The current way of doing when seeing inherited content is:

1. Clicking the "Versions" dropdown menu
2. Selecting "Create content for version V2"
3. Edit the new page