Newly created sub-articles appear in the world tree but crash when opened, showing a JavaScript error (can't access property "id", f.world is undefined).
This occurs across multiple browsers and devices (Firefox on Linux, Safari on iOS). Existing articles load normally. The issue started recently, shortly after renaming the world. Creating top-level articles and new sub-articles are affected.

Open an existing world
Create a new sub-article under any parent article in the World Tree
The new article appears correctly in the tree
Click the newly created sub-article
The editor fails to load and shows the error: TypeError can't access property id, f.world is undefined