We had this issue a few years ago, but it hasn't been fixed yet.
Occasionally we have trouble publishing items within a folder. See screenshot below. There is no option to publish. If we go into the Edit menu, we see the Publish button. We can click it, save, but it just stays unpublished.
We know that the Unit 2 Folder was originally created in a different course and then copied over. It was once unpublished, but we do not remember whether it was unpublished or published at the time we copied it over.
A workaround is to move the affected file outside of the folder, publish it, and return it into the folder.
Thanks. Any help is appreciated.