Does an update with an empty Map count bandwidth in firebase database?

I have this db:

Root
 \
 users
   \
   uid
     \
     name: "Ivan"
     \
     token: "-Mfwfeqqeqtyyetw"

To update token I use:

val map = mutableMapOf<String, Any>()
map["token"] = -Mrw-eoifpeoghqgop"
FirebaseDatabase.getInstance().getReference("/users/$uid").updateChildren(map)

Which works fine. My question is, if I comment map["token"] = "-Mrw-eoifpeoghqgop" and I perform the update with an empty Map, does it count when it comes to billing? Is the update operation still performed, or is not, as the Map is empty? In the console nothing is highlighted.