How to reproduce:

• Create a synchro for org units
• Launch the synchro to import the contents
• Modify your data source to change the relations between the org unit
• Launch the synchro again
  • The relations are updated => OK
  • but the log informs you that the contents are unchanged => KO

See SCCOrgUnitTestCase#testOrgUnitSynchroWithUser:

4 contents are modified, but the only thing that changes for the projects orgUnit is its parent org unit relation. So the nb of synchronized contents doas not take this org unit into account, it is counted with unchanged org units