UIX still present after page removed

Happened on playground.xwiki.org with version 8.4.4.

Steps:

• I've created an AWM application with a new normal local user;
• AWM registers UIX for point 'org.xwiki.platform.panels.Applications' with the scope 'Current User'
• Overnight the playground gets reset. This means that the users get deleted and also the pages created by the users
• Next day I've recreated the user and logged in: the AppBar display the UIX for the 'TEst' app, but the pages are deleted so the UIX definition is not present.

This is not a synchronization issue (XWIKI-14069) since the UIX is displayed on both playground nodes, see:

• Node1:
• Node2: