PDFAnnotation draws text upside down

Hi,

I have the following class handling custom textual pdf annotations in my app:

class PDFSheetTextAnnotation: PDFAnnotation {
    
    override func draw(with box: PDFDisplayBox, in context: CGContext) {
 
        let text = value(forAnnotationKey: .contents) as? NSString
        UIGraphicsPushContext(context)
        context.saveGState()
 
        var attributes = [
            NSAttributedStringKey.font: font as Any,
            NSAttributedStringKey.foregroundColor: fontColor as Any,
            ] as [NSAttributedStringKey : Any]
        if value(forAnnotationKey: .color) != nil {
            attributes[NSAttributedStringKey.backgroundColor] = color
        }
        text?.draw(in: bounds, withAttributes: attributes)
 
        context.restoreGState()
        UIGraphicsPopContext()
 
    }
}

Unfortunately text is drawn upside down. I tried by flipping the context with:

        context.textMatrix = .identity
        context.scaleBy(x: 1.0, y: -1.0)
        context.translateBy(x: 0, y: bounds.height)

but this seems to push my text out of the view. Looking at the original context transformation via the ctm property gives me the following result:

(lldb) po context.ctm
▿ CGAffineTransform
  - a : 2.33217189314749
  - b : 0.0
  - c : 0.0
  - d : 2.33217189314749
  - tx : -128.766743135888
  - ty : -1661.09549454122

I just can't figure out how to transform the context to get rid of the upside down flipping... any hints?

Thank you so much in advance and happy WWDC!

Arno