Array push not firing to child @Input

I’m submitting a…

[ ] Regression (a behavior that used to work and stopped working in a new release)
[X] Bug report  
[ ] Feature request
[ ] Documentation issue or request
[ ] Support request => Please do not submit support request here, instead see https://github.com/angular/angular/blob/master/CONTRIBUTING.md#question

Current behavior

I’ve this child componentA inside a parent component <componentA [setTask]="tasks"></componentA>

in the componentA setTask is an Input @Input() set setTask(value: Array<any>) { // Do stuff }

now whenever I push new item in the parent component either using this.tasks.push(item) or Array.prototype.push.apply(this.tasks, items)

the Input in the child component is not being triggered

Expected behavior

On every update on the Array the Input should be triggered. This is working just fine in 4.4.6, but not after I’ve updated to Angular 5

Environment

Angular version: 5.1.2

[dlarr]

I don’t know why but no Angular Plunkers works for me… Pain in the ass…

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