Zero-size preview.jpg at roda.sentinel-hub.com?

I like to view the lightweight Sentinel-2 L1C preview.jpg images made available under https://roda.sentinel-hub.com/sentinel-s2-l1c/tiles as announced by Gregor:
https://forum.sentinel-hub.com/t/how-to-access-s-2-meta-data-in-aws-after-bucket-goes-to-requester-pays/328

For years/month I have noted their reliable timely appearance soon after (or even before) ESA publishes its own previews at the SciHub. Thus I was surprised this morning to note a zero size image served from:
https://roda.sentinel-hub.com/sentinel-s2-l1c/tiles/32/T/ML/2020/6/30/0/preview.jpg

Any one know if this glitch might get fixed?