The GeoJSON features are only shown in the "middle" USA. They are not shown on the "left" or "right" USA. I would expect them to be present in all of them. Just like the tile layers are present in all of them.
We are using GeoJSON to show some safety information. And we do not want it to "disappear" if the user is zooming in on the place of interest but 360 degrees shifted. Since we present global stuff it is also inconvenient for the user if we add bounds to the map.
Please see the above link to the leafletjs.com web page. I can produce a minimal example if you agree on the behaviour I expect (described above).
I'm unsure of this as a core feature right now.
In the meantime you're welcome to try out https://github.com/Leaflet/Leaflet.VectorGrid , specifically with sliced GeoJSON as shown in https://leaflet.github.io/Leaflet.VectorGrid/dist/demo/demo-geojson.html
Thanks Ivan. We will try your plugin.