Why does this .indexOn: 'g' no longer work as it should? - firebase-realtime-database

Question

I can no longer place activeDrivers in the correct position to make it work. "acriveDrivers" is a direct branch of the root, so the way I placed it is as if it were a child of drivers, which seems wrong to me, but I can't find the solution.
The rules at the beginning were like this (practically no security):
{
"rules": {
".read":true,
".write": true,
"activeDrivers": {
".indexOn": ["g"]
}
}
}
New rules are:
"rules": {
"drivers": {
"$uid": {
".read": "auth !== null && auth.uid === $uid",
".write": "auth !== null && auth.uid === $uid",
"activeDrivers": {
".indexOn": ["g"]
}
}
}
}
This is the JSON of the Database:
{
"ALL Ride Requests": {
"-NJlIOrp49pNBSuuEawT": {
"destination": {
"latitude": "41.929612",
"longitude": "12.4858561"
},
"destinationAddress": "Duke's",
"driverId": "waiting",
"origin": {
"latitude": "41.919225",
"longitude": "12.5266267"
},
"originAddress": "Circonvallazione Nomentana, 270, 00162 Roma RM, Italy",
"time": "2022-12-20 21:50:48.437521",
"userName": "Peter Parker",
"userPhone": "090012321354"
},
},
"activeDrivers": {
"31uMBJKvl6PF7BVKQnqHORTrWRP2": {
".priority": "sr2yt23wk8",
"g": "sr2yt23wl8",
"l": [
41.926275,
12.5376567
]
},
"G3OJ79KiLeMmxqoUpJ1NggIKbiF2": {
".priority": "sr2yt23wk8",
"g": "sr2yt23rk8",
"l": [
41.926275,
12.5376567
]
},
"filTJu3xjiQYTzehD71kzY1Oybz1": {
".priority": "sr2yt23wk8",
"g": "sr2yy23wk8",
"l": [
41.926275,
12.5376567
]
}
},
"drivers": {
"G3OJ79KiLeMmxqoUpJ1NggIKbiF2": {
"earnings": "0.0",
"email": "simo#hotmail.it",
"id": "G3OJ79KiLeMmxqoUpJ1NggIKbiF2",
"name": "Simone Demichele Test",
"newRideStatus": "idle",
"password": "testpassword",
"phone": "3452362585",
"token": "fFIwv1IHRv2ylXyW-qRVGQ:APA91bH7IfcNBBi7Y53wRjQKN12-nBUgFHHpf7F0LeWCstG_MIqt-mkobRN6nvUZxqbMnMlXU2yMHdE-efYykUdtcXl-91wW5rGyQcpMl6Dij6bxC8snQRkAMGBhQUmyqYW6sBhY6Ul3"
},
"Gzs0qxNiE6VZrwNGPYpFPRB7J8p1": {
"email": "giacomo#gmail.com",
"id": "Gzs0qxNiE6VZrwNGPYpFPRB7J8p1",
"name": "giacomo",
"newRideStatus": "idle",
"phone": "134634564352",
"token": "cdG8W0lFRZ2F0jAeG2WbnO:APA91bHTtbtSg18sPNxcH92TIdM3UuX-qcim2-h0I_1YPcBgucIGO0I3ACIQEGVpmsg-EKcRZXFIMIXlxGk1iBw-V0hmDZBVWDyFh44yH2iM8fZgrhRsQzyVBdXdLxGMI0Vz67hQFUQU"
},
"OLhsoowb9FXTBtWQmGysGLLBgNz2": {
"email": "gino#gmail.com",
"id": "OLhsoowb9FXTBtWQmGysGLLBgNz2",
"name": "Gino",
"phone": "4568965432",
"token": "ewktnxHKRSCBWwilm_SDfd:APA91bFchfCs_33zZNGNtbUHPf6TBC3Vrua7U4QT0bX_e4cr6Z62XSPr5TwZyL-BQ12fmDa3XKnAqeLDQy7NMUKp9m8bq676jS_i5n1vjNMFYJ4tHfIYjntEwYKvOcsTp0yh4ZSvjuxb"
},
"ZYqM7SbG3IhRBAGCfXRZHHs7XdG3": {
"email": "laura#gmail.com",
"id": "ZYqM7SbG3IhRBAGCfXRZHHs7XdG3",
"name": "Laura",
"newRideStatus": "idle",
"phone": "1212432554325",
"token": "cdG8W0lFRZ2F0jAeG2WbnO:APA91bHTtbtSg18sPNxcH92TIdM3UuX-qcim2-h0I_1YPcBgucIGO0I3ACIQEGVpmsg-EKcRZXFIMIXlxGk1iBw-V0hmDZBVWDyFh44yH2iM8fZgrhRsQzyVBdXdLxGMI0Vz67hQFUQU"
},
"filTJu3xjiQYTzehD71kzY1Oybz1": {
"email": "maria#gmail.com",
"id": "filTJu3xjiQYTzehD71kzY1Oybz1",
"name": "Maria",
"newRideStatus": "idle",
"phone": "3726761919",
"token": "fFIwv1IHRv2ylXyW-qRVGQ:APA91bH7IfcNBBi7Y53wRjQKN12-nBUgFHHpf7F0LeWCstG_MIqt-mkobRN6nvUZxqbMnMlXU2yMHdE-efYykUdtcXl-91wW5rGyQcpMl6Dij6bxC8snQRkAMGBhQUmyqYW6sBhY6Ul3"
}
},
"users": {
"yHc7xseCT0QePnpolGHZvdr8ARV2": {
"email": "peter#gmail.com",
"id": "yHc7xseCT0QePnpolGHZvdr8ARV2",
"name": "Peter Parker",
"phone": "090012321354"
}
}
}
This is the query
Position pos = await Geolocator.getCurrentPosition(
desiredAccuracy: LocationAccuracy.high,
);
driverCurrentPosition = pos;
Geofire.initialize("activeDrivers");
Geofire.setLocation(
currentFirebaseUser!.uid,
driverCurrentPosition!.latitude,
driverCurrentPosition!.longitude
);