IssueTracker

Could you please provide a minimal sample that reproduces this issue?

Yes, of course

@Composable
private fun DemoNavHost() {
    val controller = rememberNavController()
    NavHost(
        navController = controller,
        startDestination = "mainRoute",
        modifier = Modifier.fillMaxSize()
    ) {

        composable("mainRoute") {
            Surface() {
                Box(Modifier.fillMaxSize(), contentAlignment = Alignment.Center) {
                    Button(
                        onClick = {
                            controller.navigate("demoDialog")
                            controller.navigate("demoDialog")   // Simulate a quick click by the user
                        }
                    ) {
                        Text(text = "show dialog")
                    }
                }
            }
        }

        dialog("demoDialog") {
            val context = LocalContext.current
            val lifecycle = LocalLifecycleOwner.current
            Surface() {
                Column() {
                    Text(text = "I'm demo dialog")
                    Button(
                        onClick = {
                            Toast
                                .makeText(
                                    context,
                                    "${lifecycle.lifecycle.currentState}",
                                    Toast.LENGTH_SHORT
                                )
                                .show()
                        }
                    ) {
                        Text(text = "check lifecycle")
                    }
                    Button(onClick = controller::popBackStack) {
                        Text(text = "close")
                    }
                }
            }
        }
    }
}

Steps:

Step 1: Click the show dialog button on mainRoute

Step 2: Because 2 pop-up windows pop up, we close the top one

Step 3: Click the check lifecycle button on the pop-up window, you can see STARTED instead of RESUMED

I have also checked the cause, which is consistent with the description in my question.

In fact, I found another problem. When the tester frequently clicks the button, the button event is to display a Dialog, Dialog is set to be destroyed by external click, so Dialog is always displayed and destroyed

Interesting thing, because it may be too fast, causing DialogHost to not notice that Dialog appears and disappears, but it has actually joined NavController#_visibleEntries

But because NavHost#DialogHost did not process DisposableEffect, it will not execute dialogNavigator#onTransitionComplete, so it will not be removed from NavController#_visibleEntries, and a NavBackStackEntry leak occurs

The reason may be that the pop-up window appears and disappears within one frame

Hi, can you please file a separate bug for the issue you see in comment#4?

On initial bug - when multiple dialogs are open at the same time and the top one is dismissed, the second dialog in backstack is marked as transitioning to hold it in STARTED state until the top dialog has completed transitioning. But the second dialog was not marked as complete when composed so it stays in STARTED state instead of moving to expected RESUMED state.

Thank you for your answer, I will open a separate post to ask a separate question;

separate question

Thanks for filing the new bug! I was thinking a separate bug for the issue you see in commment#4 with NavBackStackEntry possibly leaking. I'm gonna update the new bug's description to match that.

Fixed internally and will be available in navigation 2.7.2.