Binding reset to default value when changed with Trigger

I have an entry with amounts where i would like to present it with two decimals when its not focused and as-is when focused.
I tried to do this using Triggers on my Entry.
It is not working. For some reason, the Default value on my Binding is set, when the Property is triggered and the Binding is changed

Editing and entered the value 12

Default value is set when the formatting binding is applied.

<Entry Grid.Column="1" Text="{Binding Text}">
    <Entry.Triggers>
        <Trigger TargetType="Entry" Property="IsFocused" Value="True">
            <Setter Property="Text" Value="{Binding Text}" />
        </Trigger>
        <Trigger TargetType="Entry" Property="IsFocused" Value="False">
            <Setter Property="Text" Value="{Binding Text, StringFormat='{0:N2}'}" />
        </Trigger>                      
    </Entry.Triggers>
</Entry>

I am referencing a Bindable Property

public static readonly BindableProperty TextProperty =
    BindableProperty.Create(nameof(Text), typeof(decimal), typeof(MainPage), defaultValue: 0m);

public decimal Text
{
    get { return (decimal)GetValue(TextProperty); }
    set { SetValue(TextProperty, value); }
}

This could be somewhat related to https://github.com/xamarin/Xamarin.Forms/issues/1412

Does anyone have experience with a solution like this ? Suggestions for ways to work around this.