Some HTML files get lost, how to force them?

Breaking change in hugo 0.123
a html file in a bundle is a page resource and now page resources won’t be copied consistently.

you will have to manually publish your html files in the called template (usually single.html)

{{ range .Page.Resources.Match "**.html" }}
  {{ $publishPath := urls.JoinPath $.RelPermalink .Name }}
  {{ (.Content | resources.FromString $publishPath).Publish }}
{{ end }}

Solution taken from:

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