Copying the Sandbox Application Page Leads to Strange Effects...

Not sure if it's a problem with the Sandbox application or the "Copy" feature.

I tried to copy the Sandbox home page to a new page on the same level with a different name, to create a test case I could use to illustrate issue XWIKI-17755.

Mh... And the "Navigation" tree in the panel is loading indefinitely...

Let's reload the whole home page:

Ah, there it is... Let's access "Sandbox Test 2" by clicking it's link in the navigation tree:

Mh... And the "Navigation" tree in the panel is loading indefinitely again...

Let's click the green "edit page" link in the error text, as suggested:

Ok, looks good, so far, but the page is empty, not as expected after making a copy, but as expected after seeing the previous error page:

Whoo, we got twins:

(See the navigation tree on the left.)

Deleting this page seems to clear the mess up again then, even though immediately after deleting the page the navigation tree goes into "endless spinning" mode again...