Map not correctly plotted when tiles passed is either 'Stamen Toner', 'Stamen Terrain', or 'Stamen Watercolor'

[Wiem-benj]

Calling folium.Map() with the paramater tiles set to 'Stamen Toner', ' Stamen Terrain', or 'Stamen Watercolor' produces a blank leaflet.

The code to reproduce the issue is the following with tiles = 'Stamen Toner' case:

import folium

world_map = folium.Map(location=[56.130366, -106.346771], zoom_start=4, tiles = 'Stamen Toner') world_map

The produced map is the following screenshot (blank map)

No warning nor error is printed.