What happened?

Description

Related to #16002.

I've got a site heavily relying on a few Matrix-based page builder fields (both in Cards and Inline-Editable block views). When I have an Entry with some blocks in the page builder field, and I create a Draft out of the entry, I would expect that any edits I make to any of the blocks in the various Matrix fields would be considered "Draft" edits, and wouldn't affect the live/current state of things until the "parent" entry's Draft is applied.

In practice, however, what happens is that as soon as I save a block's edits, the live/current version of the page renders with those "draft" changes.

Steps to reproduce

1. Create a Matrix field with some bloc-err, entry types assigned, in Cards view.
2. Create a Section that makes use of the Matrix field, and the templates needed to view that content.
3. Create a "parent" entry in that section, and give it some content in the Matrix field.
4. Create a Draft version of that entry.
5. Double-click one of the cards in the Matrix field
6. Make some edits and click "Save".
7. In the "parent" entry, switch away from the Draft created in step 4, to the Current state of the entry.
8. View the current/live rendered parent entry; the block should show those draft edits.

Expected behavior

What happens in Draft, stays in Draft. 🤫

Actual behavior

What happens in Draft, is made known to all. 🫢

Craft CMS version

5.6.14

PHP version

8.2.24

Operating system and version

Linux 5.15.167.4-microsoft-standard-WSL2

Database type and version

MySQL 8.0.36

Image driver and version

Imagick 3.7.0 (ImageMagick 6.9.11-60)

Installed plugins and versions

• Button Box 5.0.0
• CKEditor 4.6.0
• Cloner 3.0.1
• Cloudflare 3.0.2
• Cloudflare R2 1.1.1
• Element API 4.2.0
• Feed Me 6.8.0
• Field Manager 4.0.3
• Freeform 5.10.5
• Hyper 2.2.4
• Icon Picker 3.0.3
• LJ Range Slider 5.0.0
• Maps 5.0.4
• Matrix Extended v4.2.1
• Minify 5.0.0
• Navigation 3.0.6
• oEmbed 3.1.3
• Postmark 3.1.0
• SEOmatic 5.1.11
• Site Copy X 2.1.1
• Super Dynamic Fields 5.0.1
• Vite 5.0.1