According to this document, when you split an issue it doesn't copy custom fields.
But I have a required custom field (platform) that I want to make sure it copied. Otherwise every issue in the system has a platform value except issues created with a split. No bueno!
I'm not sure exactly how an issue split works but, presumably, it has to create a new issue so it has to go through the create issue transition? Is there some way I could add something to that?
I'm in Cloud using (obviously) jira software in an agile board (in this case Scrum).