This is a bit of a usability issue, but it's working as designed.
You actually have all the latest objects in your local database, so there is nothing to 'Get' from source control. However, you have made some changes locally from the latest version. A history of local changes is stored by source control, so if you want to revert to the 'latest' version, you can 'undo' your local changes.
This is performed by right-clicking on the object > Other SQL Source Control Tasks > Undo changes...
This is a bit of a usability issue, but it's working as designed.
You actually have all the latest objects in your local database, so there is nothing to 'Get' from source control. However, you have made some changes locally from the latest version. A history of local changes is stored by source control, so if you want to revert to the 'latest' version, you can 'undo' your local changes.
This is performed by right-clicking on the object > Other SQL Source Control Tasks > Undo changes...
I hope this helps.