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Hello Andreas,
Thank you for sharing these findings. The fact that the issue disappeared on macOS 26.6 and returned after upgrading the same MacBook to 27.2 is particularly useful.
Based on your findings, I'd focus on the interaction between OneDrive synchronization and how macOS handles file metadata in Finder.
I'd suggest checking two things:
- Check the OneDrive sync engine
Microsoft has introduced a Native Sync Engine for OneDrive on macOS. Could you check the OneDrive version on both affected Macs?
Select the OneDrive cloud icon go to Settings then go to About.
Versions with an alphabetic suffix, such as (26K), indicate the Native Sync Engine.
Learn more about the Native Sync Engine
- Check when the metadata changes
Since you've already identified changes to kMDItemLastUsedDate using mdls, a useful next step would be to test with a non-production file:
- Record its current
kMDItemLastUsedDatevalue.
Pause OneDrive synchronization.
Have another user modify the file directly in SharePoint.
Check whether the metadata changes while synchronization is paused.
Resume synchronization and check the metadata again.
This should help determine whether the change is associated with OneDrive processing the update.
Also, please check whether both Macs are running the latest OneDrive version:
A few questions:
Are both Macs running the same OneDrive version, particularly the Native Sync Engine?
Does this affect all SharePoint libraries or only specific ones?
Does the same behaviour occur with personal OneDrive files?
I wouldn't recommend resetting or unlinking OneDrive at this stage. I'd first establish whether the metadata change is triggered during synchronization or independently of it.
Your comparison between macOS 26.6 and 27.2 provides a useful starting point for narrowing this down.
Best Regards,