dispose() {
    if (this._isOpen || this.container !== null) {
      this.close();
    }
    Data.removeData(this._element, DATA_KEY);
    EventHandler.on(this._element, 'click', this._clickHandler);
    this._element = null;
  }

schould line 98 in popconfirm not read as

EventHandler.off(this._element, 'click', this._clickHandler);

"on" => "off"