File open preview lag

Has anyone else noticed this:- during the file open dialog, the preview thumbnail shows the previous version of the file, not the latest (last saved) version. This is noticeable mainly after a "save-as" operation, where the original file was changed dramatically. Number of incremental saves on the drawing does not seem to have any affect. If the file is closed, opened and saved again, then the thumbnail is corrected for the next time. Just checked again with the latest version (11.2.8) and it is still the same for me. Not a big issue, just wondered.