I've run into what appears to be a bug in PDFKit's radio button serialization. When creating a radio button group with PDFAnnotation, only the first annotation added via page.addAnnotation() gets a correct /AS entry in the written PDF — all other annotations always get /AS /Off, regardless of buttonWidgetState. Minimal reproduction func makeRadioButton(optionId: String, isSelected: Bool) -> PDFAnnotation { let ann = PDFAnnotation(bounds: CGRect(x: 0, y: 0, width: 20, height: 20), forType: .widget, withProperties: nil) ann.widgetFieldType = .button ann.widgetControlType = .radioButtonControl ann.fieldName = Choice ann.buttonWidgetStateString = optionId ann.buttonWidgetState = isSelected ? .onState : .offState return ann } let pdf = PDFDocument() let page = PDFPage() pdf.insert(page, at: 0) // Intend to select B page.addAnnotation(makeRadioButton(optionId: A, isSelected: false)) page.addAnnotation(makeRadioButton(optionId: B, isSelected: true)) page.addAnnotation(makeRadioButton(optionId: C, isSelected: fals
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