ArcGIS Online Feature Reader not reading attachments

I have an FME process that requires me to read in an AGOL feature service that includes attachments and write the data and attachments to tables in an Enterprise SDE database on our servers. I've gotten this entire process to work on a smaller copy of some of this data, but for some reason when I run the process on the larger set of the data, none of the attachments that exist on the hosted feature layer are read by the reader at all. I definitely have "Include Attachments" turned on, and I've exposed all of the attachment related attributes: everything is identical in the FME process to the one that functions properly. There are some minor differences in the way these layers were uploaded to ArcGIS online, so I'm just wondering if there's ANYTHING on that end that could be causing this problem.