Validation of XML content failed when changing block styles in List block and publish it.
1. Create new content which contains RichText field, e.g. Article.
2. Add List block.
3. Open dropdown with block styles.
4. Click on Normal - style is changed to Paragraph.
5. Type some text.
6. Click Publish.
Cannot publish, validation message occurs, see attached screen.
Maybe block styles for List should be disabled if user cannot publish content with changed style. Or validation message could be more user-friendly.