When setting Gin as the admin theme for the Mercury Editor → , the published option isn't rendered. By default every time you save a node in the Mercury Editor edit mode, it unpublishes the node. I've tried loading Claro as the admin theme and the publish check box is there. I assume this is because Gin moves the action buttons somewhere else.
Install mercury editor and the gin admin theme. Enable mercury editor for the content type and edit a node. There is no published option.
Before:
After:
Closed: won't fix
User interface
You might want to instead open an issue in the Mercury editor issue queue so that the devs from the Mercury editor can look into why it's not properly working and fixing it on their end as we're just extending Core defaults.
So I'm closing this.