It seems to have a problem in [OpenWrt Wiki] OpenWrt in QEMU-forward_ports_of_the_host because IP address is statically assigned (at least in recent versions for arm).
Problem is that if you don't configure network address (using net=192.168.1.0/24) and you don't set up port redirection accordingly (using hostfwd=tcp:127.0.0.1:XXXX-192.168.1.1:22) as shown in some examples above this section [OpenWrt Wiki] OpenWrt in QEMU-openwrt_in_qemu_aarch64_on_apple_silicon , the qemu emulated router (with user mode) can not reach the guest and the port redirection will fail. So this section should be updated to be sure there is no configuration errors.