No network with -nic user for qemu-system-aarch64.exe while the same works fine for qemu-system-x86_64 on the same host system

Question

I am new to qemu and trying to run ubuntu cloud images with qemu 7.1 under Windows (11), the host is an Intel x64 system connected to the internet (access provided by a cable modem) over a wlan adapter.

Now when I try e.g. qemu-system-x86_64.exe .. -nic user ubuntu-22.04-server-cloudimg-amd64.img .. I have no problems in the guest to have a network connection e.g. the command ip a and hostname -I show network is set up

ubuntu@ubuntu:~$ ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: ens3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 52:54:00:12:34:56 brd ff:ff:ff:ff:ff:ff
    altname enp0s3
    inet 10.0.2.15/24 metric 100 brd 10.0.2.255 scope global dynamic ens3
       valid_lft 86310sec preferred_lft 86310sec
    inet6 fec0::5054:ff:fe12:3456/64 scope site dynamic mngtmpaddr noprefixroute
       valid_lft 86312sec preferred_lft 14312sec
    inet6 fe80::5054:ff:fe12:3456/64 scope link
       valid_lft forever preferred_lft forever
ubuntu@ubuntu:~$ hostname -I
10.0.2.15 fec0::5054:ff:fe12:3456

On the other hand, when I try the same settings with qemu-system-aarch64.exe e.g. qemu-system-aarch64.exe .. -machine virt,gic-version=max .. -nic user -drive if=none,file=ubuntu-22.04-server-cloudimg-arm64.img,id=hd0 .. then I have no network in the guest:

ubuntu@ubuntu:~$ ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: enp0s1: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default qlen 1000
    link/ether 52:54:00:12:34:56 brd ff:ff:ff:ff:ff:ff
ubuntu@ubuntu:~$ hostname -I

ubuntu@ubuntu:~$

Any idea why the enp0s1 is DOWN? Any idea how to fix that?