I converted my next-gen project to a Classic project by moving all issues to a new project. When I did this, I lost all Epic to Task/Story connections. I'm trying to reconnect the Epics to the appropriate Task/Story, but the Epic Link field only populates a few Epics. See screenshot below.

When I do select one of the available Epics that does populate, the connection doesn't appear to work. See below.

Is this a bug? Is there any known workaround for this?