InterByteTimeoutParser Not flush after timeout

[teddy1565]

I tried implement a modbusRTUSlave, use serialPort with InterByteTimeoutParser
but i get a problem

when my RTUMaster send a buffer to Slave,
Slave will get a packet, but next tick
InterByteTimeoutParser still remember the old packet,
i try use port.flush(), or just parser.currentPacket = []

but not working

my code:

modbus._serverPath = new SerialPort({
      path: options?.path ?? PORT,
      baudRate: options?.baudRate ?? BAUDRATE,
      debug: options?.debug ?? false,
      unitID: options?.unitID ?? 255
});

modbus._server = modbus._serverPath.pipe(new InterByteTimeoutParser({ interval:30, maxBufferSize: 256}));

for example i want set coil

the slave get :<Buffer 01 05 00 05 ff 00 9c 3b>

but, when i set again

slave get:<Buffer 01 05 00 05 ff 00 9c 3b 01 05 00 05 ff 00 9c 3b>

when i call port.fluse() not working, parser.currentPacket=[] still not working
if i call parser._flust(),
it will except: maximum call stack size exceeded

How can i do, when i receive the packet over modbusRTU 3.5 char timeout.
it can flush old buffer?