[5.x]: Your changes could not be stored.

What happened?

Description

After doing the Craft CMS migration from 4 to 5, we're experiencing a lot of instances where trying to save an entry results in errors.

It starts with:

1. A popup showing: "Your changes could not be stored." with the auto-save

2. Looking in the console panel I see these errors; The Craft debug panel does not show any errors

3. Saving the entry

Steps to reproduce

Upgrade Craft from 4 to 5.

Expected behavior

Would be nice if I can just resave the entry

Actual behavior

Unable to resave entries;

Craft CMS version

5.7.10

PHP version

8.4

Operating system and version

Linux 6.9.12

Database type and version

mysql 8.0.37

Image driver and version

GD 8.4.0

Installed plugins and versions

Plugin	Version
Blitz	5.11.4
Blitz CloudFront Purger	5.2.0
CKEditor	4.9.0
Dashboard Begone	3.0.0
Elements Panel	3.0.1
Feed Me	6.8.0
Field Manager	4.0.3
Google Cloud Storage	2.2.0
Hyper	2.2.6
Imager X	5.1.4
Knock Knock	3.0.3
Navigation	3.0.8
Retour	5.0.10
SendGrid	3.0.0
SEOmatic	5.1.15
Sprig	3.6.1
Template Selector	5.0.1
Translations	4.1.1
Vite	5.0.1
Vizy	3.0.9

Start by reproducing the Craft 4-to-5 upgrade on the reported PHP, MySQL, and Linux versions, then inspect the browser console and save request shown in the issue. Compare the failing save behavior with a resave attempt and identify a reproducible cause; done means upgraded entries can be saved successfully.