plymouth-quit-wait.service does not stop, boot does not finish

I have configured Plymouth with Gnome on Arch Linux and can boot without problem (as in I enter my encryption key, get to the login screen, and can successfully log in). Unfortunately, plymouth-quit-wait.service never finishes:

~ systemctl status plymouth-quit-wait

● plymouth-quit-wait.service - Hold until boot process finishes up
     Loaded: loaded (/usr/lib/systemd/system/plymouth-quit-wait.service; static)
     Active: activating (start) since Wed 2020-08-19 11:37:12 CEST; 4min 31s ago
   Main PID: 603 (plymouth)
      Tasks: 1 (limit: 38119)
     Memory: 312.0K
     CGroup: /system.slice/plymouth-quit-wait.service
             └─603 /usr/bin/plymouth --wait

Aug 19 11:37:12 hostname systemd: Starting Hold until boot process finishes

I don't understand the reason for this, as everything works fine. Where could I look for troubleshooting?