If you select more than one snapshot in the Inspector, then click the delete button and confirm that’s what you want to do in the warning message that appears, Scrivener only deletes the last snapshot selected, not all of the selected snapshots.
Thanks, I can confirm that and have added it to the list.
There is a way to delete multiple snapshots, but you have to use the Documents ▸ Snapshots ▸ Snapshots Manager
menu command, which is where you could delete many snapshots across multiple binder items as well.