RS232 to USB in a hub with other device: potential loss of data?

I'm currently using a SBC (a Raspberry Pi Zero 2W) to receive data from a device (let's call it Sensor). Sensor is connected to the micro USB port on the SBC through an adaptor with FTDI FT232R USB UART (part of the Sensor accessories). Sensor is proprietary and scarcely documented, but once every minute it sends a series of bits which I read with a Python script listening on the serial port (using the pyserial library).

These are the communication settings:

baudrate=19200, bytesize=8, parity='N', stopbits=1, timeout=None, xonxoff=False, rtscts=False

Now I also connected another device, a 4G module, to the same USB port of the SBC using a USB hub. I distinguish the two devices in the Python code by looking at the interface properties, so the script only records data from Sensor.

What happens in case of concurrent data transmission, since both Sensor and the 4G module go into the same USB port? Could data from Sensor be lost? I am running tests which seem fine, but since I still worry that there could be issues down the line.

Edit: This is an an excerpt from the code I use to read data (in a loop):

import serial
from serial.tools import list_ports

available_ports =  list(list_ports.comports())
for i, tmp in enumerate(available_ports):
    if tmp.interface == "FT232R USB UART":
        port = available_ports[i].device

ser = serial.Serial(
    port,
    baudrate=19200,
    bytesize=8,
    parity='N',
    stopbits=1,
    timeout=None,
    xonxoff=False,
    rtscts=False,
)

sensor_data = ser.read(1)
time.sleep(1)
data_left = ser.inWaiting()
sensor_data += ser.read(data_left)

It's using pyserial 3.5.