Automatic system suspend does not trigger unless user input happens
On a device (in this case the PinePhone running Mobian with Phosh+gnome-session) where automatic suspend is configured this only works when user input happened. When the device wakes up without user input, e.g., due to a system timer causing the wakeup or similar (in case of the PinePhone a wakeup also happens when the battery reaches max charge), it shows the lockscreen and never goes to suspend until user input is done once.