WkWebView Inverted Snapshot?

Xcode: Version 12.0 (12A7209), Swift 5.3, Big Sur

I was running thru test items for an app in submission and notice now - since last build on jan'31, that a snapshot

Code Block func takeSnapshot(with snapshotConfiguration: WKSnapshotConfiguration?, 
completionHandler: @escaping (NSImage?, Error?) -> Void)

Code Block
func takeSnapshot(with snapshotConfiguration: WKSnapshotConfiguration?,
completionHandler: @escaping (NSImage?, Error?) -> Void)

is inverted when the view contains a pdf image - loaded via request, now yields an inverted image; both axis are flipped.

So looking about I see there's something I hadn't noticed years ago when I wrote this

Code Block func createPDF(configuration: WKPDFConfiguration = .init(), completionHandler: @escaping (Result<Data, Error>) -> Void)

Code Block
func createPDF(configuration: WKPDFConfiguration = .init(), completionHandler: @escaping (Result<Data, Error>) -> Void)

Is this needed now or what's going on?