rp2040 with 2 CDC devices USBSer1 - second port does vanish on code-upload

[s-light]

this behavior is seen on a linux and windows system:

i have setup my sketch to create the second USB-CDC port -
(based on cdc_multi.ino) similar to this:

#include <Adafruit_TinyUSB.h>
Adafruit_USBD_CDC USBSer1;
void setup() {
    Serial.begin(115200);
    const uint32_t start = millis();
    while (!Serial && !((millis() - start) > 2000))
        yield();

    USBSer1.begin(115200);

    // serial setup done.
    Serial.println("Hello World on Main Serial");
    USBSer1.println("Hello World on second port....");
}

and this is kind of working fine.
but it seems i have to unplug and replug the board everytime i upload a new sketch.
is this normal? or can i somehow tell my computer / the uC to recheck for the devices?!?

the main CDC port does this fine too...

i am open for any kind of help :-)

[s-light]

// If already enumerated, additional class driver begin() won't take effect
    // until re-enumeration
    if (TinyUSBDevice.mounted()) {
        TinyUSBDevice.detach();
        delay(10);
        TinyUSBDevice.attach();
    }

use as written in the example sketch...