It seems there's still issues with opening AWS s3 data, I now tried:
s3://janelia-cosem-datasets/jrc_mus-liver/jrc_mus-liver.zarr/recon-1/labels/groundtruth/crop124/golgi/
which seems to just be a zarrarray and should work but i get 'unsupported type for store-like 'FSMap''
this might be a s3fs issue?