#ViewScope vs #RequestScope file download - jsf

Question

I am using:
JSF: 2.2.13
Primefaces: 6.2
PROBLEM: When I make "ImageView" bean #ViewScoped then my file downloads after pressing the button. When I make "ImageView" bean #RequestScoped then my file doesn't download and the app simply opens a new page (the current page) without any URL params (so just opens http://localhost:8080/imageView.jsf)
SUSPECTED PROBLEM: Maybe <f:param> sends diffrent things depending if the ImageView is #ViewScoped vs #RequestScope
I open the page with the following GET REQUEST http://localhost:8080/imageView.jsf?contentFileId=1
I have the following code:
<h:form id="form">
<p:commandButton id="btn" value="Download"
icon="fa fa-download" ajax="false">
<f:param name="contentFileId" value="#{imageView.contentFileId}" />
<p:fileDownload value="#{streamedContentView.image}"/>
</p:commandButton>
</h:form>
The beans:
ImageView
#Named
#RequestScoped
public class ImageView implements Serializable {
private String contentFileId;
#PostConstruct
private void init() {
HttpServletRequest request = (HttpServletRequest) FacesContext
.getCurrentInstance()
.getExternalContext()
.getRequest();
contentFileId = request.getParameter("contentFileId");
}
//...GETTERS & SETTERS
}
StreamedContentView
#Named
#ApplicationScoped
public class StreamedContentView {
#Inject
ContentFileManager contentFileManager;
public StreamedContent getImage() throws URISyntaxException, IOException {
//Get id of file
FacesContext context = FacesContext.getCurrentInstance();
Map<String, String> requestParameterMap = context.getExternalContext().getRequestParameterMap();
String rawContentFileId = requestParameterMap.get("contentFileId");
//Get file
ContentFile contentFile = contentFileManager.findById(Long.parseLong(rawContentFileId));
InputStream stream = new ByteArrayInputStream(contentFile.getContents());
return new DefaultStreamedContent(stream, contentFile.getMimeType(), contentFile.getFileName());
}
}