Yes sometime cells stay highlighted for some reason.
For example I found that this problem could appear if you add a padding and a background color to a list.
This list for example should have the problem and the rows will stay highlighted after back is pressed.
struct TestListView: View {
		var body: some View {
				NavigationView {
						List {
								NavigationLink(
										destination: Text("Detail 1"),
										label: {
												Text("Show detail 1")
										}
								)
								NavigationLink(
										destination: Text("Detail 2"),
										label: {
												Text("Show detail 2")
										}
								)
						}
						.padding(.top, 10)
						.background(Color.blue)
				}
		}
}
You can try to remove some of the list modifiers.
If you still have the problem you can try with Introspect.
https://github.com/siteline/SwiftUI-Introspect
The above code could be fixed in this way:
struct TestListView: View {
		
		@State private var tableView: UITableView?
		private func deselectRows() {
				if let tableView = tableView, let selectedRow = tableView.indexPathForSelectedRow {
						tableView.deselectRow(at: selectedRow, animated: true)
				}
		}
		
		var body: some View {
				NavigationView {
						List {
								NavigationLink(
										destination: Text("Detail 1").onAppear {
												deselectRows()
										},
										label: {
												Text("Show detail 1")
										}
								)
								NavigationLink(
										destination: Text("Detail 2").onAppear {
												deselectRows()
										},
										label: {
												Text("Show detail 2")
										}
								)
						}
						.padding(.top, 10)
						.background(Color.blue)
						.introspectTableView(customize: { tableView in
								self.tableView = tableView
						})
				}
		}
}
A little bit ugly but it works.
Topic:
UI Frameworks
SubTopic:
SwiftUI
Tags: