Thumbnail updated too early

[FreeCutter]

Bug repro:

1. Logged in to Lens
2. File in stage (Synced)
3. Applying changes to local file
4. Saving changes to local sync folder
5. --> stage of file gets updated to (Local copy newer) and thumbnail keeps unchanged
6. Single click on file listed in the Workspace box or right-click on the file in order to see the context menu

Expected result:
Thumbnail keeps unchanged as no upload had been done

Actual result:
Thumbnail is updated according to local copy of the file.
That's confusing me as no uplaod had been done but thumbnail and local 3D-view look the same.