Environment

• CLI: 5.4
• Cross-platform modules: 5.4
• Android Runtime: 5.4
• iOS Runtime: 5.4

Describe the bug
The value of the property will not be updated correctly when we used nested objects

To Reproduce

1. click on Change Fields Values button
2. update the value on one of the fields in the app
3. click Check value

Expected behaviour
The updated value to be printed in the code-behind.

Sample project
https://play.nativescript.org/?template=play-tsc&id=iBfC3Z&v=2

Workaround
Set up bindnigContext to the parent container

<StackLayout row="1" colSpan="2" bindingContext="{{testObj}}" orientation="horizontal">
            <TextField  text="{{ thing1, thing1 }}" hint="Enter text..." />
            <TextField text="{{ thing2, thing2 }}" hint="Enter text..." />
 </StackLayout>

https://play.nativescript.org/?template=play-tsc&id=iBfC3Z&v=3

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