Transcriptions are not displayed anymore

The frontend seems to load them, but the detail component stays in loading state.

Example: text lines on https://preprod.arkindex.teklia.com/element/ee01ef52-824a-4a92-927c-434eed73eecd

The text line n°2 has a transcription served by the API : https://preprod.arkindex.teklia.com/api/v1/element/777b625c-daaf-4aa5-bc89-bbcb272875b8/transcriptions/?page=1