CKEditor / Xwiki 2.1 Syntax: Multi-paragraph Highlighting Boxes

Using the WYSIWYG editor it does not easily seem to be possible to create info boxes spanning several paragraphs:

In Wiki markup view / source code view it's easy of course, and once created in source view it can also be edited in WYSIWYG mode - however then it's not really possible to leave the box again any more if there's not already space above or below it:

That's very hard-to-understand behaviour for someone who does not know about the internals of Xwiki and the Xwiki syntax and just wants to edit documents without having to care about what's going on behind the scenes.

Other rich editors allow to still navigate the cursor outside of such a box into some "empty space" before or after the box, where pressing "Enter" then will edit new rows outside of the box.

OpenProject, which also uses CKEditor, seems to provide such a behaviour.

This is reproducible.

• Xwiki LTS 15.10.7
• Browser Chromium Version 122.0.6261.94 (Offizieller Build) snap (64-Bit)
• Ubuntu 22.04 (KDE neon actually)