Can't use trackBy with KeyValuePipe

[jansivans]

I'm submitting a...

[ ] Regression (a behavior that used to work and stopped working in a new release)
[x] Bug report  
[ ] Performance issue
[ ] 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
[ ] Other... Please describe:

Current behavior

Using trackBy with KeyValuePipe like

<div *ngFor="let x of obj; trackBy: trackByFn | keyvalue"></div>

Leads to the Cannot find a differ supporting object '[object Object]' of type 'object'. NgFor only supports binding to Iterables such as Arrays. error (see StackBlitz below).

Expected behavior

Should be possible to use trackBy.

Minimal reproduction of the problem with instructions

https://stackblitz.com/edit/angular-gitter-p33nwx

Environment

Angular version: 6.1.2

[jansivans]

Seems like applying ; trackBy: trackByFn AFTER | keyvalue fixes an issue.

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