SUMMARY
My center monitor (Asus VG27AQ) has the odd behavior to disconnect display output whenever it goes into standby.
This behavior is not unique to linux and also happens on Windows. While annoying this is not really a big issue.
The problem lies in how KDE handles disconnects / reconnects of displays. 

Whenever it detects a change in the connected displays, it reloads the settings for that specific configuration.


This causes a loop of display configuration reloads if I disable it under display configuration.
The loop goes as follows:
display gets disabled,
Display goes into standby,
Disconnects the display,
kde reloads the config enabling the display,
display goes out of standby,
display reconnects,
kde reloads the config disabling the display,
and so forth. 


While I can work around this issue, by never disabling the center monitor and just turning it off instead.
I mostly wanted to notify it being a thing. 
A solution could be to put some sort of counter on reloading the display settings, such that it will not keep reloading indefinitely, or a way to disable the reloading.
I don't know how common monitors with this behavior of disconnecting are but, if there are more it may be worthwhile to build a fix for this. 


If you need more info or anything else I am willing to help.


SOFTWARE/OS VERSIONS

Linux/KDE Plasma: Arch
(available in About System)
KDE Plasma Version: 5.20.4
KDE Frameworks Version: 5.76.0
Qt Version: 5.15.2

ADDITIONAL INFORMATION
Running a 4 display settup on xorg (nvidia propriatary drivers)
3x 1440p
1x 1080p
1x 155hz, 2x 144hz, 1x 60hz