I fixed it by rebuilding the Windows Search index.
Option 1: Windows search > Indexing Options > Advanced > Rebuild.
Option 2: Windows Settings > Search for index > Choose which files and folders are indexed > Related settings > Advanced indexing options > Advanced > Rebuild.
For more...
I have the same problem with the latest OneDrive version: Build 25.020.0202.0001 (64-bit). The main folders show the blue sync icon and all the folders inside are synced, but I see the full green check icon. This is happening with the latest OneDrive rolling-out build. I reinstalled OneDrive...