The macro does not display in the wysiwyg editor

Describe the bug
The kanbanboard macro does not render in the WYSIWYG edit-mode preview. The board only appears after a full page save + re-edit. If any macro parameter is then changed, the board disappears from the preview again until the next full save / refresh.

Steps to reproduce
1. Create or edit a page in the WYSIWYG editor.
2. Insert the Kanban board macro.
3. No board preview is rendered.
4. Save the page, the board renders in view mode.
5. Edit the page, the macro is viewable in the WYSIWYG editor.
6. Change any kanban board parameter.
7. The board is gone until the page is saved and reloaded again.

Expected behavior
The macro renders a live preview in edit mode, and changing parameters refreshes the preview without requiring a full save + reload.

Actual behavior
No preview in edit mode. Parameter edits make the macro disappear until the next full save / refresh.