Parents expression shows [object Object] with webpack in uglify

Environment
Provide version numbers for the following components (information can be retrieved by running tns info in your project folder or by inspecting the package.json of the project):

• CLI: 5.4.2
• Cross-platform modules: 5.4.3
• Android Runtime: 5.4.0
• iOS Runtime: Couldn't test this on ios
• Plugin(s): NA

Describe the bug

The parent expression shows [object Object] when the project is ran with --env.uglify flag. For example following code snippet in the Label doesn't work as expected:

<span text="{{$parents['ListView']._people, $parents['ListView']._people.length }}" />

To Reproduce

1. Clone git project https://github.com/rakeshgirase/ParentAabIssue.git.
2. Run the program on android tns run android --env.uglify
3. Please add if this is a same case on ios as well!

Expected behavior
The list should show Person 1 of 12 but it shows Person 1 of [object Object]. Following is how the resulting list looks:

Sample project

https://github.com/rakeshgirase/ParentAabIssue.git

Additional context
If you enable useLegacyWorkflow in nsconfig.json then it works fine. This issue is only in webpack.

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Tái hiện vấn đề bằng cách chạy project mẫu được liên kết với tns run android --env.uglify, sau đó so sánh với thiết lập useLegacyWorkflow trong nsconfig.json. Theo dõi đường dẫn webpack/uglify liên quan đến việc đánh giá biểu thức cha. Được xem là hoàn tất khi danh sách hiển thị Person 1 of 12 với webpack/uglify cũng như với legacy workflow.