Premium plugins fail to load on Drupal 11.4.9: the CDN path uses core's 47.6.3-drupal.1 version

Problem/Motivation

Drupal core 11.4.9 changed the ckeditor5 library version in core/core.libraries.yml from 47.6.3 to 47.6.3-drupal.1 (core #3625998).

SettingsConfigHandler::getDllVersion() maps only 47.6.3 to 47.7.4 and otherwise returns the core version as is. So the premium plugin scripts are requested from https://cdn.ckeditor.com/ckeditor5/47.6.3-drupal.1/dll/..., which returns 404, while the 47.7.4 files return 200.

Result: premium plugins fail to load with JavaScript errors in the editor, and the Layout Builder "Configure block" dialog can fail to open. Found in the Varbase Project 10.1.5 release pipeline: 8 of 15 functional suites failed on core 11.4.9 with 1.8.5, and core 11.4.8 worked.

Steps to reproduce

1. Drupal core 11.4.9 with CKEditor 5 Premium Features 1.8.5, a premium plugin enabled on a text format.
2. Open a content form that uses that format.
3. The console shows 404s for https://cdn.ckeditor.com/ckeditor5/47.6.3-drupal.1/dll/... and the premium plugins do not load.

Proposed resolution

In getDllVersion(), strip a trailing -drupal.N build suffix from the core version before the mapping lookup. 47.6.3-drupal.1 then resolves to 47.7.4, and later core rebuilds resolve to the published CDN version.

Remaining tasks

• ✅ File an issue
• ✅ Addition/Change/Update/Fix
• ✅ Testing to ensure no regression
• ➖ Automated unit/functional testing coverage
• ➖ Developer Documentation support
• ➖ User Guide Documentation support
• ➖ UX/UI designer responsibilities
• ➖ Accessibility and Readability
• ✅ Reviewed by a human
• ✅ Code review by maintainers
• ✅ Full testing and approval
• ✅ Credit contributors
• ✅ Review with the product owner
• ✅ Update Release Notes
• ✅ Release

User interface changes

• N/A

API changes

• N/A

Data model changes

• N/A

Release notes snippet

• Premium plugins load again on Drupal core 11.4.9, whose CKEditor 5 version carries a -drupal.1 suffix.