I did not have this problem with theme.parts or theme.layout_parts. Obviously tried restarting the server and had this same issue in Safari and Chrome. (See attached screenshot).
The navigations are created as records in the database, you can run rails spina:bootstrap to run the callbacks that create them. Sorry, I should clarify this in the documentation!
I'm setting up my first Spina project and when I try to add the example custom navigation in the docs, it doesn't appear in the admin UI.
I did not have this problem with theme.parts or theme.layout_parts. Obviously tried restarting the server and had this same issue in Safari and Chrome. (See attached screenshot).