This issue is actual for all switches, not only for "com.apple.Preferences"
I just tested this issue with the latest xcode 11.3 release, same problem...
Have the same issue on iOS 11 device. Did you find any solutions?
We are seeing this same issue. We build with Xcode 11 and target iOS 11 - iOS 13 devices. We run our tests on FTL (which doesn't yet support iOS 13) and have found that we can no longer toggle switches on previous iOS versions. Has anybody filed a bug with on this yet? I have opened FB7555409 to report this issue.