Currently, as new granules are ingested into a mosaic, the bbox for the coverage is not updated automatically.
There is a REST call that can be used to force GeoServer to update the bbox but it would be nice if this
was done automatically as new granules are ingested into the mosaic.
Would likely require a separate parameter to enable this behavior, leaving the current behavior for backwards compatibility. For reference, doing updates via WFS-T does not update the layer bbox either.