NavigationManager different behavior on WebAssembly since 8.0.3

[alex-fitplans]

Is there an existing issue for this?

• I have searched the existing issues

Describe the bug

I'm not exactly sure how to title this issue.

Consider the following simplified code, that adds a dummy navigation before displaying a popup (here using mudblazor, but the issue isn't specific to it), so that the user can navigate back to close it:

@page "/"
@inject NavigationManager NavigationManager
@inject IDialogService DialogService
@using MudBlazor
@implements IDisposable
@rendermode InteractiveServer

<PageTitle>Home</PageTitle>

<MudButton OnClick="Callback" Variant="Variant.Filled" Color="Color.Primary">Click Me</MudButton>

@code
{
    private IDialogReference? _currentDialog = null;
    
    protected override void OnInitialized()
    {
        base.OnInitialized();
        NavigationManager.LocationChanged += NavigationManagerOnLocationChanged; 
    }

    private void NavigationManagerOnLocationChanged(object? sender, LocationChangedEventArgs e)
    {
        if (_currentDialog != null)
            _currentDialog.Close();
    }

    private async void Callback()
    {
        var options = new DialogOptions { CloseOnEscapeKey = true };
        NavigationManager.NavigateTo("/#", false, false);
        _currentDialog = await DialogService.ShowAsync<SampleDialog>("Simple Dialog", options);
        var result = await _currentDialog.Result; 
        if (!result.Canceled)
        {
            // Do something
        }
        
        // Navigate back - example
        NavigationManager.NavigateTo("/", false, true);
    }

    public void Dispose()
    {
        NavigationManager.LocationChanged -= NavigationManagerOnLocationChanged; 
    }
}

This code worked fine both on WebAssembly and InteractiveServer modes until 8.0.2. After 8.0.3, the same code still works in InteractiveServer, but no longer pops the popup in WebAssembly.

Expected Behavior

I would expect the same behavior between WebAssembly and Interactive Server modes.

Steps To Reproduce

I've created a small repro here: https://github.com/alex-fitplans/sample-popup
Simply click on the button on the home page.

Downgrade to 8.0.2 (or to previous commit) to restore the functionality.

Exceptions (if any)

No response

.NET Version

8.0.3

Anything else?

No response

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Thank you for filing this issue. In order for us to investigate this issue, please provide a minimal repro project that illustrates the problem without unnecessary code. Please share with us in a public GitHub repo because we cannot open ZIP attachments, and don't include any confidential content.

[mkArtakMSFT]

@alex-fitplans please make sure you provide a repro without any dependencies (MudBlazor in this case).

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