Problem registering GET routing handler after using routing groups and adding a filter

[wangfei9999]

Is there an existing issue for this?

• I have searched the existing issues

Describe the bug

using WebApplication3;

var builder = WebApplication.CreateBuilder(args);

// Add services to the container.
// Learn more about configuring Swagger/OpenAPI at https://aka.ms/aspnetcore/swashbuckle
builder.Services.AddEndpointsApiExplorer();
builder.Services.AddSwaggerGen();

var app = builder.Build();

// Configure the HTTP request pipeline.
if (app.Environment.IsDevelopment())
{
    app.UseSwagger();
    app.UseSwaggerUI();
}

app.MapGroup("/").AddEndpointFilter<Filter>().MapGet("/jac", () => int.MaxValue);

app.Run();

internal record WeatherForecast(DateOnly Date, int TemperatureC, string? Summary)
{
    public int TemperatureF => 32 + (int)(TemperatureC / 0.5556);
}

public class Filter : IEndpointFilter
{
    public ValueTask<object?> InvokeAsync(EndpointFilterInvocationContext context, EndpointFilterDelegate next)
    {
        return next(context);
    }
}

Expected Behavior

No response

Steps To Reproduce

No response

Exceptions (if any)

No response

.NET Version

net8.0

Anything else?

No response