Building with Xcode 15.3 shows 2 new concurrency warnings:

Sources/Nuke/Processing/ImageProcessors+Resize.swift:88:60
Main actor-isolated static property 'scale' can not be referenced from a non-isolated context; this is an error in Swift 6

Sources/Nuke/Internal/Graphics.swift:198:44
Main actor-isolated static property 'scale' can not be referenced from a non-isolated context; this is an error in Swift 6

Screen is indeed marked @MainActor:

@MainActor
enum Screen {
#if os(iOS) || os(tvOS)
    /// Returns the current screen scale.
    static let scale: CGFloat = UIScreen.main.scale
#elseif os(watchOS)
    /// Returns the current screen scale.
    static let scale: CGFloat = WKInterfaceDevice.current().screenScale
#else
    /// Always returns 1.
    static let scale: CGFloat = 1
#endif
}