Unable to mark field programmatically as invalid

[mlindhout]

Bug Report or Feature Request (mark with an x)

- [x ] bug report -> please search issues before submitting
- [ ] feature request

OS and Version?

MacOS Big Sur

Versions

Angular CLI: 11.1.0
Node: 12.3.1
OS: darwin x64

Angular: 11.1.0

Repro steps

use is described in documentation:
<mat-google-maps-autocomplete #gma
country="nl"
type="address"
required="true"
(onChange)="onAdresChange($event)"
addressLabelText="Adres"
placeholderText="Begin met typen..."
requiredErrorText="Adres is verplicht"
invalidErrorText="Dit is geen geldig adres"
(onAutocompleteSelected)="onAutocompleteSelected($event)">

When using formControl name, stacktrace appears, see bug (#305). When using the elementRef 'gma', no options to mark field as invalid.

The log given by the failure

Desired functionality

Mention any other details that might be useful

[AnthonyNahas]

This is a good point!

PR are welcome