Not work correctly with Paragraphs

Thanks for the post. What is the use case? Is it your intent that people are registering for the paragraph, or the node/entity the paragraph is attached to.

Use case, an event with multiple occurrences : a node "event" that references a paragraph "time slot" with registration.

Thanks for that info, I'll see what it takes to make it work using the Paragraph as the host entity.

If not using paragraph, but use node reference instead and same inline_entity_form_settings form-display, when creating a registration, the data in registration_settings_field_data is corrupt... The entity_id column is set to 0.