To bump an old thread... UUID is now Sendable!
https://developer.apple.com/documentation/foundation/uuid/
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I have also seen this problem with xcrun altool for several days.
Using Transporter worked about the problem for me (but is a bad workaround long term because it prevents scripting).
I've submitted Feedback FB9742349 on this problem, please consider filing your own Feedbacks / Radars.
2 years later...
I found a simple way to force an SKView to live resize on Mac; just make it think it's not live resizing and it won't halt the redraws:
class LiveResizeSKView: SKView {
override public var inLiveResize: Bool {
get {
return false
}
}
}