Somehow it was uninstalled. Weird.
There was also a bug in the code. Maybe a node.js version issue.
Adding rewards breaks with rewards-essentials.
Having an issue when I add another rewards plugin. Awards are no longer populated after you create the reward and go back to the page. This makes it impossible to edit rewards. It only seems to happen with reward essentials. Adding two rewards plugins and disabling rewards essentials works.
If anyone else want to help, I posted two simple rewards plugins on the issue, since I could not find any npm published rewards plugins.
Glad to see others making rewards plugins
Hopefully you and @psychobunny can debug this issue...