Angular ControlValueAccessor checkbox always true when using SVG

I have a custom checkbox component that currently uses some Material Icons icons to display. I'm using the component in a few places, but I'm having trouble with one specific instance.

I have a grid with checkboxes along the left side to select multiple rows at once. When <i> is used to display the icon from the font, these checkboxes work properly. When I switch to using an SVG instead, these checkboxes break. I can only select one at a time, and I can't deselect one that's selected. If I check a box, it checks like you'd expect. If I click it again, nothing happens--the box stays checked. If I check a different box, the first one is unchecked.

This is the original checkbox component template:

<label class="my-checkbox" [class.pointer]="!disabled">
  <input
      type="checkbox"
      class="form-control norowclick"
      [class.indeterminateinput]="indeterminate"
      [checked]="checked"
      [(ngModel)]="value"
      (blur)="onBlur()"
      [disabled]="disabled"
  >
  <i class="material-icons md-18 indeterminate norowclick">indeterminate_check_box</i>
  <i class="material-icons md-18 checked norowclick">check_box</i>
  <i class="material-icons md-18 unchecked norowclick">check_box_outline_blank</i>
</label>

This is the new template, using angular-svg-icon. When rendered, there's an <svg-icon> element with the <svg> element as its only child. This is the only change made to any of the code, this is what causes it to break.

<label class="my-checkbox" [class.pointer]="!disabled">
  <input
      type="checkbox"
      class="form-control norowclick"
      [class.indeterminateinput]="indeterminate"
      [checked]="checked"
      [(ngModel)]="value"
      (blur)="onBlur()"
      [disabled]="disabled"
  >
  <svg-icon name="indeterminate_check_box" class="icon-18 indeterminate norowclick"></svg-icon>
  <svg-icon name="check_box" class="icon-18 checked norowclick"></svg-icon>
  <svg-icon name="check_box_outline_blank" class="icon-18 unchecked norowclick"></svg-icon>
</label>

This is the checkbox component code:

@Component({
  selector: 'my-checkbox',
  templateUrl: './my-checkbox.component.html',
  styleUrls: ['./my-checkbox.component.less'],
  providers: [
    {
      provide: NG_VALUE_ACCESSOR,
      useExisting: forwardRef(() => MyCheckboxComponent),
      multi: true
    }
  ]
})
export class MyCheckboxComponent implements OnInit, ControlValueAccessor {
  @Input() formControlName: string;
  @Input() checked: boolean = false;
  @Input() indeterminate: boolean = false;
  @Input() disabled: boolean = false;
  public control: AbstractControl;

  private innerValue: any = '';
  private controlContainer: ControlContainer;

  private onTouchedCallback: () => void = noop;
  private onChangeCallback: (_: any) => void = noop;

  constructor(
    @Optional()
    @Host()
    @SkipSelf()
    private _controlContainer: ControlContainer
  ) {
    this.controlContainer = _controlContainer;
  }

  ngOnInit() {
    this._getFormControl();
  }

  private _getFormControl() {
    if (this.controlContainer) {
      if (this.formControlName) {
        this.control = this.controlContainer.control.get(this.formControlName);
      }
    }
  }

  get value(): any {
    return this.innerValue;
  }

  set value(v: any) {
    if (v !== this.innerValue) {
      this.indeterminate = false;
      this.innerValue = v;
      this.onChangeCallback(v);
    }
  }

  onBlur() {
    this.onTouchedCallback();
  }

  writeValue(value: any) {
    if (value !== this.innerValue) {
      this.innerValue = value;
    }
  }

  registerOnChange(fn: any) {
    this.onChangeCallback = fn;
  }

  registerOnTouched(fn: any) {
    this.onTouchedCallback = fn;
  }
}

The grid column is rendered as a template like this. When passed to the checkSecret() function, $event.target.checked is always true in the new version.

<ng-template #checkBoxTemplate let-value="value" let-item="item">
  <div class="rowCheck">
    <span *ngIf="!item['isFolder']" [class.rowHoverInline]="!hasSelections()">
      <my-checkbox class="norowclick" [checked]="item['isSelected']" (change)="checkSecret(item, $event)"></my-checkbox>
    </span>
  </div>
</ng-template>

from Angular ControlValueAccessor checkbox always true when using SVG