It seems component inside modal will not update anymore

Following code, {this.props.field.name} will not change after state change, unless we change {isOpen}
The children components' updating are blocked.

Not sure why, any ideas?

```
      <Modal isOpen toggle={closeModal}>
        <ModalHeader toggle={closeModal}>{this.props.field.name}</ModalHeader>
        <ModalBody>
            ...
        </ModalBody>
      </Modal>
```
