Enabling footnotes on WordPress custom post types

Are footnote options/blocks not available in the block editor for your custom post type? As of WordPress 6.5 footnotes are available for custom post types, but only if the following options are enabled during post type registration:

1. Custom Fields
2. Editor
3. Revisions

The custom post type must also be accessible to the WordPress REST API.

Aside from this github pull request (which outlines the above prerequisites) I couldn’t find documentation on footnote requirements for custom post types. But, enabling those post type options seems to do the trick.