QSerialPort does not properly set baud rate

It appears that when a serial port is opened, the baud rate is set but it is not set at the correct moment. Assuming that you have a device with a baud rate of 115200, this baud rate is set so you can communicate with the device, e.g. using the code

    QSerialPort gspSerialPort;
    gspSerialPort.setBaudRate(115200);
    gspSerialPort.open(QIODevice::ReadWrite); 

But unlike other programs, such as minicom, this is either not set persistently or using the same way the e.g. stty does it because upon opening, you receive a bunch of garbage data because the serial port is being opened at the wrong baud rate, so you receive garbage like:

"\x87\xC9\x96\xD9\xB6\xD9\x87\xC9\x87\xD9\x96\xD9\x96\xC9\xB6\xD9\x96\xC9\xC7\xC9\x97\xD9\xB6\xD9\xB6\xC9\x96\xD9\x87\xC9\xEF\x87\xC9
\x87\xC9\x96\xC9\xC7\xC9\x87\xC9\xC7\xC9\x16\xFA\x96\xD9\x87\xC9\x87\xC9\x87\xD9\xEF\x87\xC9\xC7\xC9\x87\xC9\x87\xD9\xEF\xFF\xFF\x16\
xFA\x96\xC9\x96\xD9\x96\xC9\xC7\xC9\x96\xD9\xB6\xD9\x97\xD9\xC7\xC9\x96\xC9\xC7\xC9\x96\xD9\xC7\xC9\xFF\xEF\xC7\xC9\x96\xC9\xEF\xFF\x
F7\xC7\xC9\x86\xD9\xC7\xC9\x87\xC9\xC7\xC9\x87\xD9\x87\xD9\xC7\xC9\x96\xD9\x97\xD9\xC7\xD9\x97\xD9\xB6\xD9\x96\xD9"
"Hello wo"
"rld fr"

So whilst it does change to 115200, it does not start at 115200. This can be confirmed by checking with stty:

stty -F /dev/ttyACM0  
speed 9600 baud; line = 0;
-brkint -imaxbel 

If this is manually used to set the baud rate to 115200 with stty, then opening the port with Qt no longer gives a bunch of garbage at the start before giving correct output but fully gives the correct text. For comparison, the output with stty after having used minicom with a baud rate of 115200:

stty -F /dev/ttyACM0  
speed 115200 baud; line = 0;
min = 1; time = 5;
ignbrk -brkint -icrnl -imaxbel
-opost -onlcr
-isig -icanon -iexten -echo -echoe -echok -echoctl -echoke