Manually changing actor photos

[unmesh59]

My media files already have NFO files that were created by Ember Media Manager and the media added to Jellyfin libraries. If I change actor photos from the Jellyfin GUI, will a subsequent library rescan restore the original photos and lose these changes? I ended up initiating a rescan if I change the media file within a folder. Maybe it is safer to rescan only that title but I haven't found a way.

Thanks