When publishing a new vector tile package (vtpk) to ArcGIS Online, a vector tile layer is published automatically (on demand). The hosted vtpk becomes a reference to the layer.
I can update then the hosted vtpk (with newer data), but the corresponding vector tile layer does not update.
WISH: add the possibility to update the content of the vector tile layer (or even better > do it automatically).
OR: give the possibility to create an additional vector tile layer with the updated data an then use the replace layer functionality.