The current codebase does not provide support for managing menu links in OG menus from within the node form.
When adding or editing a node, a menu link can only be added / edited in the core menus that are made available for that content type.
In our use case, we also want editors to add menu links to the OG menus they have access to from within this UI.
Since the OG menus are not listed on the content type "available menus" third-party settings form, and given we don't want to manually select the dynamically created OG menus for each content type anyway, some custom code will be needed to achieve this.
Needs review
2.0
Code
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
The logic here interferes with core's standard node form logic.
I'm not sure why og_menu_form_node_form_alter() includes logic to force $form['menu']['enabled']['#default_value'] to be TRUE on new nodes, so this changes it subtly.