List views jittering in SwiftUI - swiftui

Question

I have a master detail view that navigates a series of sequential lists using totally vanilla SwiftUI and I'm noticing two things.
The list rows width jitters when you access one via navigation link?
The .navigationBarTitle isn't visible until the new view is completely on screen?
Seems like neither of these things are suppose to happen? Wonder if anyone has any ideas (video and code attached).
Video of the issues: https://www.dropbox.com/s/5jq3e8chay6hsy5/jitter.mov?dl=0
UserList.swift:
import SwiftUI
struct UserList: View {
var body: some View {
NavigationView {
List(userData) { this in
NavigationLink(destination: CityList(user: this, cities: this.cities)) {
UserRow(user: this)
}
}
.navigationBarTitle(Text("Users"))
}
}
}
UserRow.swift:
import SwiftUI
struct UserRow: View {
var user: UserModel
var body: some View {
VStack(alignment: .leading) {
Text(user.firstName + " " + user.lastName)
.font(.headline)
}
}
}
CityList.swift:
import SwiftUI
struct CityList: View {
var user: UserModel
var cities: [CityModel]
var body: some View {
List (cities) { this in
NavigationLink(destination: TownList(city: this, towns: this.towns)) {
CityRow(city: this)
}.navigationBarTitle(Text(self.user.firstName + self.user.lastName))
}
}
}
CityRow.swift:
import SwiftUI
struct CityRow: View {
var city: CityModel
var body: some View {
VStack(alignment: .leading) {
Text(city.name)
.font(.headline)
}
}
}