The icon data is firstly driven by any global metadata established in the respective tab of the compile overview screen. This will match the file name of the created project originally, but the way it is set is as static text, meaning that if name of the project changes on the disk, the formal title of the work does not change. This will typically be desirable behaviour since most project name changes represent versions/backups of one work.
Another thing to be aware of is that the Quick Look data, which includes the icon, is updated whenever the project fully saves. So if you simply open a project, change one thing in the compiler, save the settings there and close, it might not update unless you commit some change somewhere other than purely to the metadata.
So the fix to this problem with the icon is something you need to do anyway in the Compiler, if the title of the work is now “The Mind Reader’s Journey”, rather than “Conclusive Evidence”.
And if you’re of the mind that the title of the work should track along with the project name no matter what, then just clear whatever text you have for the Title, in the Metadata tab. You’ll note it prints placeholder text matching the current project name when doing so. Now if you rename the project and reload it the icon should track with each filename change (again, assuming something significant enough to trigger a Quick Look update has happened).
I ran a quick compile with the newly entered correct name in the metadata tab, but that alone didn’t fix it.
I find the Save As and work from there approach works better than creating templates, because I’m always refining my use of Scrivener, and that takes advantage of my latest discoveries. Also, if it’s a new book in the series, then all my characters and settings are there.
I’ll probably forget this next time I start a new book, but I rarely look at the finder icons in this situation. You might want to change how this works.
I guess I don’t understand. I forced Scrivener generate a new thumbnail.jpg file in the QuickLook folder, and then Finder showed the new icon. IOW, I concluded that Scrivener controlled what was in that file.