Adding Multiple Terms via Media Library and Inline Entity Form

Problem/Motivation

in a complex setup involving Media Library and Inline Entity Form, I am encountering an issue when adding multiple items to a field.

Specifically, I have a field referencing a taxonomy vocabulary with a multiple-choice option with inline entity form complex, allowing either the selection of existing terms or the creation of new ones. However, when I insert an item through the integrated Media Library, only the first term gets saved, even if I add or create multiple terms (e.g., two terms).

This behavior seems to prevent proper handling of multiple terms in this specific context.

Version Drupal : 10.3.2
Version IEF: 3.0.0-rc20

Steps to reproduce

1. Configure the Media Entity
   • Create a media entity M.
   • Add a field T to the media entity M, with a taxonomy term reference field allowing multiple values.
   • Edit the display settings for field T, enabling Inline Entity Form - Complex, with the option to add new terms or select existing ones.
2. Set Up the Paragraph
   • Create a paragraph type P with a field referencing the media entity M.
   • Set the display mode of this field to use the Media Library.
3. Create and Test in a Node
   • Create a node N and add a paragraph of type P referencing media entity M.