How to trigger ngOnChanges to update my formgroup

Question

My parent component subscribes to param changes:

this.route.queryParamMap.pipe(take(1)).subscribe(params => {
      const changedQueryParams = {};
      params.keys.forEach((key) => {
        const values = params.getAll(key);
        if (values.length > 0) {
          changedQueryParams[key] = values;
        }
      });
      this.queryParams = changedQueryParams;

populating an object: queryParams = {};

I pass it to my child component which has a FormGroup

<child-component
[queryParams]="queryParams" 
></child-component

the child component's variable: @Input() queryParams= {};

The ngOnChanges:

ngOnChanges(changes: any): void {
      if(changes.queryParams && changes.isFirsChange){
        this.filterFormGroup.patchValue(changes.queryParams, {emitEvent:true})
      }
  }

I've tried defining the object in the parent component based off other answers I've seen on here:

this.queryParams = {...changedQueryParams}

I did some console.logs but nothing is printing out.
Why isn't my formgroup updating?