Bug#991135: WiFi start is delayed by 5 minutes and networking-routes.service/start deleted to break ordering cycle

[Peter Mueller]

Package: systemd
Version: 247.3-5
Reproduce:
1) Boot the computer.
2) Have no WiFi approximately 5 minutes long.
3) Have WiFi after 5 minutes.
It doesn't matter whether WiFi is tested from gnome or from tty.  My network is configured via interfaces (not via NetworkManager).
I have a PCE-AX3000 card and use an up-to-date Debian 11 “Bullseye” with firmware-iwlwifi. The bugs has existed since the fresh installation in January 2021 with all the current kernels so far.
$ cat /etc/network/interfaces # This file describes the network interfaces available on your system # and how to activate them. For more information, see interfaces(5).
source /etc/network/interfaces.d/*
# The loopback network interface auto lo iface lo inet loopback
## The primary network interface allow-hotplug wlp179s0 iface wlp179s0 inet dhcp ## This is an autoconfigured IPv6 interface iface wlp179s0 inet6 auto wpa-ssid o2-WLAN00 wpa-psk AnonymizedPassword
## detect wired interfaces when they become available allow-hotplug enp6s0 enp7s0
# raise the wireless interface as primary auto wlp179s0
$ sudo journalctl -b | grep -B 4 "ordering cycle" Jul 15 11:39:39 DtPC systemd[1]: systemd 247.3-5 running in system mode. (+PAM +AUDIT +SELINUX +IMA +APPARMOR +SMACK +SYSVINIT +UTMP +LIBCRYPTSETUP +GCRYPT +GNUTLS +ACL +XZ +LZ4 +ZSTD +SECCOMP +BLKID +ELFUTILS +KMOD +IDN2 -IDN +PCRE2 default-hierarchy=unified) Jul 15 11:39:39 DtPC systemd[1]: Detected architecture x86-64. Jul 15 11:39:39 DtPC systemd[1]: Set hostname to <AnonymizedHostname>. Jul 15 11:39:39 DtPC kernel: usb 1-11.4.3: new high-speed USB device number 9 using xhci_hcd Jul 15 11:39:39 DtPC systemd[1]: network.target: Found ordering cycle on networking-routes.service/start Jul 15 11:39:39 DtPC systemd[1]: network.target: Found dependency on network.target/start Jul 15 11:39:39 DtPC systemd[1]: network.target: Job networking-routes.service/start deleted to break ordering cycle starting with network.target/start
$ cat /etc/network/interfaces.d/* auto lo iface lo inet loopback
# auto eth0 # iface eth0 inet dhcp
How to debug this further? (I don't wish to clutter this bug report with tons of potentially unrelated logs; please advise.)
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