I'd want to see how "mock GPS" applications are working, so I installed "Fake GPS Location" from PlayStore, and works flawlessly (obviously I set such app in the developer options to mock the gps location). In facts both Google Maps and Whatsapp report the GPS location which I set, but Telegram doesn't get this setting: still reports my real location. I tried to set the GPS accuracy, in Android's settings, to low and high, I also rebooted the phone, with no dice.
Why? There is some other workaround that I miss?