[5.x]: Integrity constraint violation after updating to 5.2.9/fixing #3805

[gopeter]

What happened?

Description

I want to create a new product (under special circumstances which are described in "Steps to reproduce") but get a "Integrity constraint violation" error once I want to save it.

I did a lot of local debugging and this commit breaks our current shop: cdb0426

Steps to reproduce

1. Create a multi-site (important!) shop
2. Create a product where revisions are enabled (important!)
3. Create a matrix field with a simple entry type
4. Add this matrix field to the variant fields of this product and set propagation method to "save everywhere the owner is saved" (important!)

I was also able to reproduce it in the demo shop: https://living-eft-ae150c3.demo.craft.cloud/admin/commerce/products/bike/820960?site=default&draftId=83&fresh=1#tab04-variants (I've added a second test site and a test matrix field called "Settings")

Craft CMS version

5.5.9

Craft Commerce version

>= 5.2.9

PHP version

No response

Operating system and version

No response

Database type and version

No response

Image driver and version

No response

Installed plugins and versions

No response

[linear]

PT-2396 [5.x]: Integrity constraint violation after updating to 5.2.9/fixing #3805