Drag-Drop doesn't work inside cdkDropListGroup if ShadowDom is enabled & *ngFor is used

[dusk196]

Reproduction

https://stackblitz.com/edit/angular-uh31tp?file=src%2Fapp%2Fapp.component.ts

Steps to reproduce:

Initially, it works fine with ViewEncapsulation.None

1. Change the encapsulation to ShadowDom
   Observation: Doesn't work

2. Now go to app.component.html and comment out the *ngFor section & uncomment the individual hard-coded section.
   Observation: Works as expected

Expected Behavior

Drag-Drop should work inside cdkDropListGroup if ShadowDom is enabled & *ngFor is used

Actual Behavior

Drag-Drop doesn't work inside cdkDropListGroup if ShadowDom is enabled & *ngFor is used. But if we disable ShadowDom, it works fine

Environment

Angular CLI: 8.3.9
Node: 10.16.0
OS: win32 x64
Angular: 8.2.10

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