CORE-generated multi-image manifests not working on Clover or Universal viewers

[SteveMarvin]

https://core-data-cloud-staging-2c51db0617a5.herokuapp.com/core_data/public/v1/places/ad21a937-3fb1-456f-80c3-99e586792ef8/manifests/347db8c8-08f6-4022-9bc4-e07915641144

Loads fine on Mirador, doesn't load at all on Clover, and only displays first image on Universal.