FPS mismatch when using pyserial

I am reading raw hex data from a TI IWR1843BOOST radar module through pyserial. The radar is configured with a measurement rate of 35 fps, so the python code is expected to receive a single packet every 29 ms. However, pyserial seems to be receiving two packets (occasionally three packets) consistently at one shot every 60 ms or so, therefore data is coming in at 17 fps despite the radar is measuring at 35 fps. I am not sure if it's the inherent issue of the radar where it will hold on to the first packet and send together with the second packet when the second one is ready because these procedures are already hard coded to the radar chip. So could it be the way I am waiting and reading for data wrong? Attached is the pyserial code and the output I obtained.

def read_data_from_sensor(port, baudrate):
try:
    with serial.Serial(port, baudrate, timeout=0.1) as ser:
        print(f"[INFO] Listening to {port}...")
        while True:
            data = ser.read(ser.in_waiting)
            # Find the beginning of the data
            magic_indices = find_magic_indices(data)
            packets = []
            for i in range(len(magic_indices)):
                start = magic_indices[i]
                end = magic_indices[i+1] if i+1 < len(magic_indices) else len(data)
                packet = data[start:end]
                parsed = decode_packet(packet)
                packets.append(parsed)
            for i, pkt in enumerate(packets):
                print(f"\nPacket {i+1}:")
                print(pkt)

except Exception as e:
    print(f"[ERROR] Failed to read data: {e}")

#####OUTPUT EXAMPLE#####
Packet 1:
{'header': {'magic0': 258, 'magic1': 772, 'magic2': 1286, 'magic3': 1800, 'version': 50725376, 'packet_len': 128, 'platform': 661571, 'frame_num': 80, 'cpu_cycles': 1159072654, 'num_obj': 0, 'num_tlvs': 3, 'subframe_num': 0}, 'objects': [], 'snr': [], 'noise': [], 'statsinfo': [{'interFrameProcessingTime': 2998, 'transmitOutputTime': 632, 'interFrameProcessingMargin': 24202, 'interChirpProcessingMargin': 0, 'activeFrameCPULoad': 1, 'interFrameCPULoad': 10}]}
   
Packet 2:
{'header': {'magic0': 258, 'magic1': 772, 'magic2': 1286, 'magic3': 1800, 'version': 50725376, 'packet_len': 160, 'platform': 661571, 'frame_num': 81, 'cpu_cycles': 1164801812, 'num_obj': 1, 'num_tlvs': 4, 'subframe_num': 0}, 'objects': [{'x': 1.038146734237671, 'y': 1.6446927785873413, 'z': -0.18966545164585114, 'v': 1.7290256023406982}], 'snr': [136], 'noise': [471], 'statsinfo': [{'interFrameProcessingTime': 3069, 'transmitOutputTime': 523, 'interFrameProcessingMargin': 24416, 'interChirpProcessingMargin': 0, 'activeFrameCPULoad': 1, 'interFrameCPULoad': 9}]}