Loading OpenStreetMap tiles fails because their TLS certificate CN doesn't match URL's used by Graylog: https://a.tile.osm.org/1/0/0.png
Replacing osm with openstreetmap in the URL works: https://a.tile.openstreetmap.org/1/0/0.png
This isn't strictly a Graylog issue, though, so do with it what you will.
Steps to reproduce the problem
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