MatTree not closing children

[mackelito]

Bug, feature request, or proposal:

Bug

What is the expected behavior?

Child elements should NOT show when parent is closed

What is the current behavior?

Children still showing

What are the steps to reproduce?

1. Open Vegetables > Onion
2. Close Vegetables

https://stackblitz.com/angular/bqnqjjvgjym?file=app%2Ftree-dynamic-example.html

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