In 3.0, the construction data containers are not currently working. This specifically refers to:
Smoothed covering grids
The easiest way to resolve this will be to either allow supplying supplemental masks to data selection (for the latter two) or to allow iteration ordered on resolution and spatial location.
One option for doing this would be to add a new set of spatial-style chunking operations. For instance, chunk based on the resolution. Additionally, chunks should allow for supplying all data, not just non-masked data.