Angular 角度材质自动完成的选项Selected不会选择任何下拉值

我已将Angular应用程序从版本8更新为Angular 9。升级后，从“角度材质”中的“自动完成组件”中选择的选项不再起作用。所选值不反映在输入字段中，仅为空。如果我遗漏了什么，请告诉我

search.html

<form [formGroup]="parentForm" [ngClass]="{ invalidError: invalidError }" autocomplete="off">
  <mat-form-field class="full-width">
    <input
      type="text"
      placeholder="{{ placeholder }}"
      matInput
      [matAutocomplete]="auto"
      formControlName="{{ controlName }}"
      [formControl]="formControl"
      (blur)="validateInput()"
      (keyup)="validateInput()"
    />
    <mat-autocomplete
      #auto="matAutocomplete"
      (optionSelected)="getValueSelected()"
      [displayWith]="getOptionValue.bind(this)"
    >
      <mat-option *ngFor="let option of filteredOptions | async" [value]="option">
        {{ option[keyName] }}
      </mat-option>
    </mat-autocomplete>
  </mat-form-field>
</form>

  @Output() selectedValue: EventEmitter<Object> = new EventEmitter<Object>();

   getValueSelected() {
    this.selectedValue.emit({
      controlName: this.controlName,
      parentForm: this.parentForm,
      value: this.formControl.value
    });
  }

<app-search-select
        placeholder="Occupation"
        [parentForm]="employmentForm"
        [data]="occupationList"
        controlName="occupation"
        keyName="occupationShortName"
        (selectedValue)="setSelectedValue($event)"
        [defaultValue]="employmentForm.controls.occupation.value"
        title="{{ employmentForm.controls.occupation.value }}"
      >
      </app-search-select>

setSelectedValue(selectedValue) {
    // value just key with empty string
    console.log(selectedValue);
  }