Replace display: none with opacity: 0 on data layer (if it exists).

Hiding the data layer in Illustrator commonly sets display: none instead of opacity: 0 for the corresponding SVG group. This causes events to fail entirely on the data layer.

If the data groups exist in a layer together, ensure that layer is using opacity: 0, not display: none.

This reduces a step during the Illustrator SVG export and allows us to not have to hand-edit the SVG after export.