Default social image not updated

[rinusvandam]

Description

We updated SEO to version 3.5.4 and set a default social image for our entries. All posts that didn't had a social image set now have the default social image. That works fine.

Now we want to change the default social image, so we replaced the image in SEO settings. The problem is that the posts with the default social image are not being updated.

Steps to reproduce

1. Set default social image
2. Check entries SEO
3. Update default social image
4. Images not being updated

Additional info

• Craft version: Craft Pro 3.1.8
• SEO version: 3.5.4
• PHP version: 7.3.0
• Database driver & version: MySQL 5.7.23