Problem with shell composition information when downloading occurrences

[balsedie]

I downloaded occurrence records using the API and I've noticed that many taxa (genera) do not have a composition. But if I enter the PBDB webpage and search for the taxon, I can see the information about composition. For example, if I download all occurrences of Rhipidomella (https://paleobiodb.org/data1.2/occs/list.csv?base_name=Rhipidomella&taxon_reso=lump_genus&show=full,acconly&) the composition column is empty. But if you go to the webpage I can see that it is "low Mg calcite" (https://paleobiodb.org/classic/checkTaxonInfo?taxon_no=26974&is_real_user=1).
It is weird that other genera do have the information in their occurrences, as for example Desmoinesia (https://paleobiodb.org/data1.2/occs/list.csv?base_name=Desmoinesia&taxon_reso=lump_genus&show=full,acconly&). Both Rhipidomella and Desmoinesia have their composition constrained at the phylum level.
I do not know if this is an issue with the API path I am using, or if there is an issue with the downloading of occurrences.
Best,
Diego