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After lots and lots of digging, I chanced upon a line of code on Github like this:const CFStringRef kQLThumbnailPropertyIconFlavorKey_10_5 = CFSTR("IconFlavor");
const CFStringRef kQLThumbnailPropertyIconFlavorKey_10_15 = CFSTR("icon");from here: https://github.com/shysaur/QLWindowsApps/commit/52f1e070a3fd09371b5194487f1413585b280d02It appears that the undocumented key for the icon "flavour" was changed in Catalina. So for now, this problem can be resolved using the old QLGenerator API. This doesn't change the fact that using the new QuicklookThumbnailing api/framework, there's no way to set this property, and given that the old API has been deprecated, this issue still remains.Hopefully this might help future-people googling about this issue, if a moderator ever decides to approve this post.