I Had a similar issue when passing a Core Data value between views.if I recall correctly I solved it by also including the @Environment(\.managedObjectContext) (possibly also the @FetchRequest as well) into the DetailView. When toggling the value the view then updated once the managed object was saved to the context.
jeastwood
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Making sure that you have imported Foundation:
print(String(format: "%.2f", 123.4567))