1. XB10 is a new release. Can you make sure you are running v1.0.20260724 which was validated on XB10 data (albeit a 3T Vida).
  https://github.com/rordenlab/dcm2niix/re...
2. It might be worth knowing the sequence where readout time is not provided. In particular, you will need the latest version of dcm2niix to read details from the ep3d research sequences.
   https://github.com/neurolabusc/dcm_qa_ep3d
3. If thse do not resolve your problem, I suggest creating a Github issue and providing steps to replicate.