Asset duplicated from asset field when used in a Matrix field

[tommysvr]

Description

Inside a Matrix field, an asset uploaded via an asset field in one entry type is 'duplicated' inside the CkEditor field in another entry type.

Steps to reproduce

1. Create a Matrix field with two entry types: CkEditor & Assets
2. In the CkEditor entry type, add a CkEditor field with the 'Inset image' item in the toolbar, and under assets set the 'Default Upload Location' to a volume
3. Upload an asset to the image field
4. Asset will also be added to the CkEditor field

CleanShot.2026-03-10.at.14.01.29.mp4

CkEditor field settings:

Additional info

• Craft version: 5.8.15
• PHP version: 8.4
• Database driver & version: MySQL 8.0
• Plugins & versions: CkEditor 5.1.0

[linear]

PT-3059

[edhebert]

I'm experiencing this bug, and it's affecting the ability for my client to use their content builder matrix field properly.

[i-just]

Thanks Tommy! I raised a PR for this.