Tilemap & geo coordinates shows no results although index seems to be correct

Elastic Stack Kibana
1

I have events which contain a geoLocation sub structure:

{
...
 "geoLocation": {
    "lat": 12,
    "lon": -12
 }
...
}

I create a mapping which specifies geoLocation as a geo_point. This is also correctly shown in the Kibana frontend in the Indices settings. If I try to create a tile map using these geo coordinates (geoLocation field is also shown as a possibility in the drop down) I always get no results found.

In the overview tab I verified that geoLocation is correctly shown a geo_point field. Any ideas?