Communication stuck at 9M baud

[Elixz89]

Hello

I have installed the linux driver for the CH348 and I am trying to get it working using python.
When I run the test script tty_uart.c I see that I am transmitting at 9M baud while I set the speed -S to 115200

With python using pyserial I can open the port but when I transmit somethin I do not see anything.
I have a loopback plug attached to the RX-TX

How is this possible?

[gionag]

same situation here