I'm currently using Xcode 12.0 beta 4 (12A8179i) with the same issue.
This has been broken for me since the first Xcode beta. It's disappointing that this is still unusable mid-way through the beta cycle. Developing on a physical device isn't doable for everyone since it's not recommended to put the betas on devices not soley devoted to development.
I hope this is fixed in the next beta.
naturaln0va
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I found that setting the parentWindow property fixes the stutter I was experiencing. Specifically in my GameKit helper where I configure the game's root window I also set this property:
func configure(with window: UIWindow?) {
self.window = window
if #available(iOS 14.0, *) {
GKAccessPoint.shared.location = .bottomTrailing
GKAccessPoint.shared.showHighlights = false
GKAccessPoint.shared.parentWindow = window
}
}