Yes, as noted in the 1.4.2 change log:
Finder QuickLook plugin fixed, which will also fixes cases of Scapple files not showing their preview when imported into a Scrivener project binder, or in the Bookmark preview pane when linked to files.
If this is the version you are using and it still does not work, you might need to run some Web searches for fixing Quick Look, either globally or specifically for one program that isn’t working right. It is not uncommon for it to break and require reset.
Otherwise if it resists ordinary Mac-level troubleshooting, I would advise testing against the latest public beta.