So I’ve figured a little bit more out.
This system has 2 software RAID-1 sets. One is for the system drive and all of the data is located on the other RAID set.
I created a new folder on the system drive as well as the data drive. After sharing both of these using the default settings, I was able to read the share on the system drive but not the data drive. I tried disabling and then reenabling acl support on the data drive and also verified the disk using disk utility.
This is getting strange…