Titanium fan disks separation tend to have material property problems rather than wear out modes. This often can be parsed down by a group within a manufacturing date making it easier on forced inspection to only a few engines in the suspect batch.
Gross material defects tend to fail at half life design cycles and are more often small batch related. Failures at very low cycle counts are extremely rare and unlikely to be manufacturing related.
No idea what this one is, but there are some hints in the photos in post #3 matched with some of the earlier posts in this thread. and you don't need all the disk pieces to confirm where the fracture initiation came from