Lockscreen multi-monitor displaying desktop contents

For as long as I remember using the lock-screen of XFCE (which is only 2 years) on EndeavourOS (Arch) I have the following problem. I have two displays and a receiver. Locking the system and turning a display/receiver off makes you able to see the contents of the desktop. My system is almost always running the latest updates and only ever lags behind 2-3 weeks.

Steps to reproduces:

1. Have multiple displays.
2. Lock the screen.
3. Turn one of the displays off.
4. Enjoy seeing the contents of your desktop.