Steps to reproduce the issue

1. Create custom field Introduction text.
2. Create new article.
3. Fill text into Introduction text custom field.
4. On Article Text field insert this custom field as intro text.
5. Create module Article Newsflash module.
6. Insert module into another article (i.e. frontpage article).

Expected result

✔️ The intro text should be visible on all articles.

Actual result

✔️ The intro text is visible on articles, where intro text is entered as text on main content field.
❌ The intro text on the articles, where it was entered as custom field, is not visible.

System information (as much as possible)

Additional comments