Shell navigation doesn't update view - xaml

Question

I have a Shell MAUI app with two pages: a form and a list. After inserting a new record with the form and navigating to the list page, it's not updated. I can easily achieve this without MVVM using this:
private void OnBackToMenu(object sender, EventArgs e)
{
Navigation.PushAsync(new MainPage());
}
How can I achieve the same with MVVM?
Here's my shell:
<Shell
x:Class="Production.Savings.Maui.AppShell"
xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
xmlns:local="clr-namespace:Production.Savings.Maui"
xmlns:views="clr-namespace:Production.Savings.Maui.Views"
Shell.FlyoutBehavior="Disabled">
<TabBar>
<Tab Title="Transactions">
<ShellContent ContentTemplate="{DataTemplate views:TransactionsPage}" />
</Tab>
<Tab Title="Add New">
<ShellContent ContentTemplate="{DataTemplate views:AddNewPage}" />
</Tab>
</TabBar>
</Shell>
public partial class AppShell : Shell
{
public AppShell()
{
InitializeComponent();
Routing.RegisterRoute(nameof(TransactionsPage), typeof(TransactionsPage));
Routing.RegisterRoute(nameof(AddNewPage), typeof(AddNewPage));
}
}
View:
<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
x:Class="Production.Savings.Maui.Views.TransactionsPage"
xmlns:viewmodel="clr-namespace:Production.Savings.Maui.ViewModels"
xmlns:model="clr-namespace:Production.Savings.Maui.Models"
x:DataType="viewmodel:TransactionsViewModel"
Title="TransactionsPage">
<VerticalStackLayout>
<CollectionView x:Name="transactionsList"
ItemsSource="{Binding Transactions}"
SelectionMode="None">
<CollectionView.ItemTemplate>
<DataTemplate x:DataType="model:Transaction">
<Label Text="{Binding Amount}"/>
</DataTemplate>
</CollectionView.ItemTemplate>
</CollectionView>
</VerticalStackLayout>
</ContentPage>
public partial class TransactionsPage : ContentPage
{
public TransactionsPage(TransactionsViewModel vm)
{
InitializeComponent();
BindingContext = vm;
}
}
Viewmodel:
public partial class TransactionsViewModel: ObservableObject
{
public TransactionsViewModel()
{
Transactions = new ObservableCollection<Transaction>(App.TransactionRepository.GetAllTransactions());
}
[ObservableProperty]
ObservableCollection<Transaction> transactions;
}