No it is not a glitch. When the database was created (back in Version 3.24), we only incorporated the data (for what we considered the most common materials) that we needed to satisfy the Codes that the software supported. In the case of S_y, this value was only needed for the transportation codes.

Five years later, we added the capability to perform a "hydrotest" load case. We simply haven't had the time to revisit the Material Database and add this additional data for those materials where it wasn't needed before.