When Katello imports puppet modules we allow them to be uploaded and published but it can fail quietly at the last step - importing them into Foreman side. Foreman ignores quietly directories that have modules with syntax errors, so if you upload one in Katello, it all happens successfully but never shows up in the UI.

We should compare what we expect to be in the puppet environment with what ends up there, and show a warning to the user perhaps with a hint about syntax problems.