Running on boot with Systemd does not work without "After=multi-user.target"

[zehata]

I have noticed that running on boot with Systemd does not work without After=multi-user.target on my machine. Not sure if it's specific to me.

This works for me:

[Unit]
Description=undervolt
+ After=multi-user.target
After=suspend.target
After=hibernate.target
After=hybrid-sleep.target

[Service]
Type=oneshot
ExecStart=/home/zehata/Desktop/undervolt/undervolt.py -v --core -91 --cache -91 --temp 94 -p1 8 10 -p2 10 1

[Install]
WantedBy=multi-user.target
WantedBy=suspend.target
WantedBy=hibernate.target
WantedBy=hybrid-sleep.target

System info:
Xubuntu 24.04.2 LTS
Kernel version: 6.14.0-24-generic

$ systemctl --version
systemd 255 (255.4-1ubuntu8.10)
+PAM +AUDIT +SELINUX +APPARMOR +IMA +SMACK +SECCOMP +GCRYPT -GNUTLS +OPENSSL +ACL +BLKID +CURL +ELFUTILS +FIDO2 +IDN2 -IDN +IPTC +KMOD +LIBCRYPTSETUP +LIBFDISK +PCRE2 -PWQUALITY +P11KIT +QRENCODE +TPM2 +BZIP2 +LZ4 +XZ +ZLIB +ZSTD -BPF_FRAMEWORK -XKBCOMMON +UTMP +SYSVINIT default-hierarchy=unified

Let me know if any more debug info is needed.