resources.Copy silently fails with page resources

[jmooring]

This works:

{{ with resources.Get "a.jpg" }}
  {{ with . | resources.Copy "b.jpg" }}
    <img src="{{ .RelPermalink }}" width="{{ .Width }}" height="{{ .Height }}" alt="">
  {{ end }}
{{ end }}

This silently fails:

{{ with .Resources.Get "a.jpg" }}
  {{ with . | resources.Copy "b.jpg" }}
    <img src="{{ .RelPermalink }}" width="{{ .Width }}" height="{{ .Height }}" alt="">
  {{ end }}
{{ end }}

Reference:
https://discourse.gohugo.io/t/copying-a-resource-in-page-bundles/42077/2

---

Here's a trick to get this to work... call the Publish method. Seems that .RelPermalink isn't publish the resource.

{{ with .Resources.Get "a.jpg" }}
  {{ with . | resources.Copy "b.jpg" }}
    <img src="{{ .RelPermalink }}" width="{{ .Width }}" height="{{ .Height }}" alt="">
    {{ .Publish }}
  {{ end }}
{{ end }}