So the parent resource is blank, which is correct as it’s at root level.
I change the parent to another resource and saved it, and it showed up in the resource tree.
But when I change it back to ‘website’ which is the root level context, it disappears again!
What I did was change the parent resource to another resource in the tree, and then i manually dragged it to the root level rather than selecting the parent in the settings, and it’s still there.
I’ve cleared the cache, logged out and back in again - it’s still there - seems fine.