fix issue 433 - preserve attributes when splitting data

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 89.55%. Comparing base (11122d4) to head (f51e956).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #434 +/- ## =========================================== + Coverage 89.36% 89.55% +0.18% =========================================== Files 49 49 Lines 9838 9835 -3 =========================================== + Hits 8792 8808 +16 + Misses 1046 1027 -19 ```

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