How to reproduce :

• Create a validator to easily generate errors on content modification (only server side eroors)
• Add this custom validator to on content type's attribute
  • One at root of the content type, another in a repeater
• Modify a content of this type
• Add an error in both attributes
• Save
  • The error dialog box appears => OK
• Click on ok button
  • Fields in the are marked as error => OK
• In attribute at root
  • put focus on the attribute
  • leave focus
  • The error still appears => OK
• In attribute in repeater
  • put focus on the attribute
  • leave focus
  • The error disappears => KO