Hey @Gregfgn,
I just wanted to add some context on previous points I shared.
The option available in File > Sync Library Components… is not meant to create a new Version. This option will check that Components that exist in your document have the latest changes available from the last version of the Library that you have access to. It will not create a new version. Many times you’ll have all changes. This option can be handy for some specific scenarios but then again, it’s not related to Versions or Version creation.
These are safeguards. If you keep making changes and do not create a version, there’s a real need to put a limit on that, otherwise you’d end up with a gigantic list of changes that will take a lot of time to process or it could make the app hang.
Quitting the app is a similar scenario. If you quit and have made changes but you didn’t create a new Version, those changes need to be saved, so Sketch will create an Autosave Version.