PDFKit – Pages turn black

I am making an app to display magazines as PDFs. Sometimes whilst viewing the PDF (usually after scrolling and zooming around), certain pages will turn black. I have linked a screenshot of this problem.

 

The black pages return to normal after I reload the page or execute

 

webView.transform = CGAffineTransform(rotationAngle: 0)
webView.frame = view.safeAreaLayoutGuide.layoutFrame

 

What’s causing this and how can I prevent it?

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