The next tls variable of an vehicle can be accessed using command traci.vehicle.getNextTLS. However, when I try to subscribe the variable ID (0x70, 112, traci.constants.VAR_NEXT_TLS) corresponding to this command, it come out an error:

FatalTraCIError: Unknown variable 70 or invalid type 0f.

Bellow are codes this error located:

self.conn.junction.subscribeContext(
    objectID=self.temp_junction_id,
    domain=traci.constants.CMD_GET_VEHICLE_VARIABLE,
    dist=1e8,
    varIDs=[
        traci.constants.VAR_NEXT_TLS,
    ]
)

Is this variable ID not yet supported subscription? Or maybe I did something wrong?

SUMO-version: Eclipse SUMO sumo Version 1.20.0

operating system: Windows 11 Professional 10.0.22631