What happened?

Description

On May 24 2024 I created an issue regarding problems when saving modified matrix blocks. Today I encountered the same problem again.
When modifying an existent matrix block, adding a new block and then saving the entry, all the data in the modified matrix block gets lost.

Steps to reproduce

1. Create a new matrix field
2. Add some entry types (e.g. 'Plain Text')
3. Disable the title field and generate the title from the plaintext field
   
4. Add the matrix field to a section
5. Create a new entry in the section
6. Add an entry to the matrix
   
7. Save the entry using Ctrl+S
8. Modify the created matrix block
9. Add a new entry to the matrix
   
10. Save again
11. All the changes are lost
    

Expected behavior

The modified matrix entry should be saved after saving the entry.

Actual behavior

Changes on a modified entry are lost, after adding a new entry to the matrix.

Craft CMS version

5.2.6

PHP version

8.3

Operating system and version

Linux using ddev

Database type and version

MariaDB 10.6

Image driver and version

No response

Installed plugins and versions

• ether/seo v5.0.0-rc4
• craftcms/ckeditor 4.1.0