What happened?

Steps to reproduce

1. Install Joomla 6.2.0-alpha-dev.
2. Log in to the administrator backend.
3. Navigate to Content → Articles → New or open an existing article for editing.
4. Navigate to Content → Categories → New or open an existing category for editing.

Observed behavior

The page fails to load and shows the following error:

There is no "tinymce" asset of a "script" type in the registry.

This prevents administrators from creating or editing articles and categories.

Version

6.2

Expected result

The article/category editor form should load normally with the configured editor (TinyMCE) available, allowing administrators to create or edit content.

Actual result

Instead of loading the editor form, Joomla throws an application error:

There is no "tinymce" asset of a "script" type in the registry.

As a result, content creation and editing in the administrator backend is blocked.

System Information

• Joomla Version: 6.2-dev
• PHP Version: 8.4
• Database: MySQL 9.4
• Web Server: NGINX
• Operating System: Windows 11
• Browser: Microsoft Edge / Chrome / Brave

Additional Comments

This issue occurs consistently for both article and category create/edit pages.

The error suggests that the TinyMCE script asset is not being properly registered in the Web Asset Manager before the editor is rendered.