In PDFKit on MacOS, if you create a PDFView and matching Thumbnail View, and then set the PDFView to Horizontal: selecting the thumbnail no longer move the PDFView to the correct page.
It works for all styles of View (Two Page Continuous, etc) in Vertical orientation.
Our engineering teams need to investigate this issue, as resolution may involve changes to Apple's software. Please file a bug report, include a small Xcode project and some directions that can be used to reproduce the problem, and post the Feedback number here once you do. I'll check the status next time I do a sweep of forums posts where I've suggested bug reports and post any information about changes I am able to share to this thread.
Bug Reporting: How and Why? has tips on creating your bug report.
