Edit paragraph entity, orphaned entity

Hello,

I use entity_embed to insert paragraph entities inside texts. The rendering works and the paragraph is clearly visible on the page.

If I want to modify the paragraph, I click in the wysiwyg on the entity and a popup appears. But, I cannot access to the fields of the entity and this mention is displayed: orphaned paragraph: .... (see image)

How can I solve this problem?

Thanks for your help.