I had the same issue and the issue still exist.
As a work around, I installed "Modbus TCP to Modbus RTU Gateway Add-on" and used the pymobus serial connection
DEVICE: /dev/ttyUSB0
BAUDRATE: 9600
MODE: 8N1
TIMEOUT: 5
LOGLEVEL: 2
PORT: xx.xxx.xxx.xxx:502
DEVICE: /dev/serial/by-id/usb-1a86_USB2.0-Ser_-if00-port0
DRIVER: pymodbus