Demo Flavor can't be updated in the DW

Happened on a 9.11 with demo flavor installed, after upgrading to 9.11.1.

When the distribution wizard appears after relaunch of XWiki :

• The Demo Flavor is noted "Installed but not valid" (1st screenshot)
• All the other dependencies are ok.
• Trying to repair or upgrade doesn't work.

After choosing the XWiki Standard Flavor to go on and launch the Wiki :

• Go to the Extension manager (2nd screenshot)
• Click on the "Continue" button under the Demo Flavor component (which is still noted as invalid)
• The upgrade of the Demo Flavor goes perfectly well this time