### Describe the bug After the release of the chapter display feature, as a user I don't see the chapters on all podcast's episodes. ### Steps to reproduce For published podcasts : 1. Go to https://podcast.projets-libres.org/@projetslibres/episodes/castopod-est-son-propre-reseau-social-episode-2-y-doghri-et-b-bellamy-ad-aures/chapters , a chapter tab is displayed, but no chapters are available 2. In a podcast client app (for example AntennaPod), chapters are available for this podcast. When previewing a non published podcast : Castopod displays the chapter tab, but is unable to list chapters. ### Expected behavior All chapters are displayed for published and non published podcasts. ### Actual behavior Chapters are available for some episodes but no all episodes. Chapters are not available for podcasts in preview mode. ### Relevant logs and/or screenshots  ### Context - Castopod: castpod.com, version 1.10.3 ### Possible fixes [If you can, link to the line of code that might be responsible for the problem]