I am trying to use the MapBox Geocoding API and for it I tried to translate "Centre Hospitalier Régional d'Orléans" (that is an Hospital in France, Orléans) into Lng/Lat coordinates.
When I display a MapBox Map, I can see the POI: 
And when I click it in MapBox Studio, it is well recognized as a Point Of Interest (POI) (poi-label):
But when I try to find it using the Geocoding API, I don't find it.
Here is the request I run:
https://api.mapbox.com/geocoding/v5/mapbox.places/Centre%20Hospitalier.json?access_token=pk.eyJ1IjoibWF0dGZpY2tlIiwiYSI6ImNqNnM2YmFoNzAwcTMzM214NTB1NHdwbnoifQ.Or19S7KmYPHW8YjRz82v6g&cachebuster=1547469044480&autocomplete=true&country=fr&proximity=1.909251%2C47.902964
Is it normal ? Am I doing something wrong or is it a bug ?