I don’t understand this but I think there is an answer. I checked a Shortform I published today that has read more but I published a few yesterday that were not published with read more. I don’t know what the difference is but I will investigate.

Get the Medium app

A button that says 'Download on the App Store', and if clicked it will lead you to the iOS App store
A button that says 'Get it on, Google Play', and if clicked it will lead you to the Google Play store