Ahmet, the new version of the Service Graph Connector for Intune seems to have fixed the issue. See second bullet point on release notes below for v2.3.1

Once I upgraded and ran the import, the Most Recent Discovery matched the last synch time we see coming over in the Intune data.

Release Notes

Fixed

• SG - Intune Computer data source was not updating the discovery source in the Network Adapter [cmdb_ci_network_adapter] table
• SG-Intune Software data source was updating the most recent discovery of computers to the scheduled import time"