Invalid contexts with UIGraphicsImageRenderer

Graphics contexts created by UIGraphicsImageRenderer are somehow invalid for reading the width and height. This code:

let image = UIGraphicsImageRenderer(size: CGSize(width: 100, height: 60)).image { context in
    let width = context.cgContext.width
    print("Width is \(width).")
    let height = context.cgContext.height
    print("Height is \(height).")
}

Unexpectedly logs this:

CGBitmapContextGetWidth: invalid context 0x600003704600. If you want to see the backtrace, please set CG_CONTEXT_SHOW_BACKTRACE environmental variable.
Width is 0.
CGBitmapContextGetHeight: invalid context 0x600003704600. If you want to see the backtrace, please set CG_CONTEXT_SHOW_BACKTRACE environmental variable.
Height is 0.

It works fine with this older API that’s marked API_TO_BE_DEPRECATED:

UIGraphicsBeginImageContext(CGSize(width: 100, height: 60))
let context = UIGraphicsGetCurrentContext()!
let width = context.width
print("Width is \(width).")
let height = context.height
print("Height is \(height).")
let image = UIGraphicsGetImageFromCurrentImageContext()!
UIGraphicsEndImageContext()

Logs the expected output:

Width is 100.
Height is 60.