How to reproduce

• I have a Intranet site with the project catalogs service
• I have two categories of projects
• I create a new projet without category "Echanges avec Ametys"
• The projet appears at the top of service outside categories (OK)
• I ediit the projet and add the category "Espaces collaboratifs"
• The page is refreshed but the project is still outside categories, it did not move to the "Espace collaboratif" category (KO)
• When I edit the projet I can sse that the category was take into account