New <leaflet-control-layers> wraps Control.Layers. Children with
slot="base" or slot="overlay" and a name attribute are automatically
registered as base layers or overlays. The control intercepts child
leaflet-register events and stops propagation so layers are managed
by the layers control rather than added directly to the map.
Unchecked layers that connected before the control are removed from
the map before the control initialises, so Control.Layers._addItem
correctly reflects the unchecked state on first render.
Buddy