Issue identified: Since we did not fully support AMR grids using the openPMD reader, in the last iteration of updates we skipped all arrays whose variable names contain _lvl. This was done because the openPMD reader crashed when there were arrays with different shapes becase of different levels of refinement. As a side effect, the feature the data that was previously possible to load will break. If you’re interested I can send a python drop-in replacement to get around the issue until we implement full AMR support in the near future.