Android shows data only notifications in tray

When I send a data only notification (no message, no title, just a data JSON) then it means I only want the app to receive the data. I do not want anything to show up in the notification tray.

On iOS this works as expected. On android I am getting empty notifications in the notification tray that just say my app name and that’s it.

Reproduce by just going here and only filling out the pushToken field and the JSON data field and send to an android phone.

How can I stop empty notifications like this from showing up in android?