❔ ✅ AddSingleton and AddDbConnection are not running whatsoever

I have this code

services.AddSingleton<DbConnection>(_ =>
{
    SqliteConnectionStringBuilder stringBuilder = new()
    {
        DataSource = "MemoryDb",
        Mode = SqliteOpenMode.Memory
    };
    SqliteConnection connection = new(stringBuilder.ToString());
    connection.Open();

    return connection;
});

services.AddDbContext<MerpieContext>((serviceProvider, options) =>
{
    var connection = serviceProvider.GetRequiredService<DbConnection>();
    options.UseSqlite(connection, sqliteOptions =>
    {
        sqliteOptions.UseNodaTime();
    });
});

The configuration lambdas are not running. I have no idea why. The DbConnection and MerpieContext are being added to the services, but they're not being configured.
I've tried setting breakpoints inside the lambdas but they're never hit.