Summary.h5 /geometry/cells/cell <uid>/ has dataset named fill, but it’s not mentioned in documentation

[8electron]

Hi everyone,
I’m currently trying to reconstructs the geometry.xml file based on summary.h5 and i notice that the summary.h5 documentation doesn’t contain info about **/geometry/cells/cell /fill. However the summary.h5 does contain the /fill info.
just a reminder of the documentation, and I've post this in Discourse Forum already.

[8electron]

Another thing. In the statepoint file, the keys of the /runtime/ datasets only contains: <KeysViewHDF5 ['SEND-RECV source sites', 'accumulating tallies', 'active batches', 'inactive batches', 'reading cross sections', 'sampling source sites', 'simulation', 'synchronizing fission bank', 'total', 'total initialization', 'transport']>
and there's not datasets called "writing statepoints"