In v12.26 and 12.27, OneDrive sync status is now showing as a green tick for a file that is currently syncing (shows a syncing icon in Windows Explorer or v12.25). This issue occurs in these versions but is fine in 12.25 and before. I have tested by installing the various versions and then repeating a test edit to a synced file.
Windows 10, OneDrive Personal. Currently using version 21H2. I was on version 21H1 when I first saw the issue in v12.26.
I have always had the OneDriveBugMitigation registry key set to 0, since at least April 2020, and have not previously seen any problems with the syncing icons.