Cypress - Get [value] value property from mat-button-toggle-group

I have a selector to <mat-button-toggle-group [value]="myValue"></mat-button-toggle-group>

I want to have access to [value] value, and for that I do.

buttonToggleGroupSelector.should('exist').and('has.value', 'MyValue');


But this returns an empty string and not the attribute value.

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