How to reproduce:

• Configure 2 right profiles:
  • administrator has all administration rights on workspaces
  • contributor has no administration right on workspaces
• The connected users have contributor profile for all contexts
• In projects' catalog, a connected user can not edit a project => OK
• Affect the administrator profile to connected users on a context that has nothing to do with workspaces (on a content type for example)
• In the projects' catalog, the connected user can now edit a project => KO