Error on choice in body of annotation

[triplingual]

Writing the IIIF cookbook recipe for an annotation with content in multiple languages (choice of language), I see that Mirador loads the resource fine and loads the location of the annotation, but barfs when it comes to loading the annotation content. Seems to be when it gets to the body of the annotation, which has a Choice as shown in the Web Annotation Data Model

Manifest URLs:
https://preview.iiif.io/cookbook/0346-multilingual-annotation-body/recipe/0346-multilingual-annotation-body/manifest.json

Mirador 3 demo page loading that manifest:
https://projectmirador.org/embed/?iiif-content=https://preview.iiif.io/cookbook/0346-multilingual-annotation-body/recipe/0346-multilingual-annotation-body/manifest.json