Weird One Pixel Line below windows

Hey, I want to tell you about a weird issue I’m facing crossdistros. Currently Running the Stable Branch of Manjaro.
The issue is that, bellow every maximized window lies a one pixel (I guess) line. Screenshot to exemplify.
I see the same on Fedora KDE. Not a big deal but kind of annoying.
Wodering if some of you face or solved something like that.

Kernel: 5.18.17-1-MANJARO 
Uptime: 16 hours, 51 mins 
Packages: 1464 (pacman), 26 (flatpak) 
Shell: bash 5.1.16 
Resolution: 3000x2000 
DE: Plasma 5.24.6 
 WM: KWin 
Theme: [Plasma], Breeze [GTK2/3] 
 Icons: [Plasma], breeze [GTK2/3] 
 Terminal: konsole 
                               CPU: Intel i7-8550U (8) @ 4.000GHz 
                               GPU: NVIDIA GeForce MX150 
                               GPU: Intel UHD Graphics 620 
                               Memory: 4330MiB / 15752MiB 


Is this happening only with GTK+ applications?

Hey, thanks for answer.
No, it happens also with KDE apps.

this artefact is a gift of using the intel-graphics-driver. use your nvidia permanent instead (why do you buy hardware and don’t use it). the uhd-620 is a very limited gpu.
also please provide us with the information of the inxi-command described below. this is the minimum-basic information you should give, everything else is sticking in the dark.

Will not use nvidia permanently only use for offloading to avoid heat and high battery usage. I do use the hardware I bought.

Here is the output:

inxi -F 
  Host: manjaro Kernel: 5.18.17-1-MANJARO arch: x86_64 bits: 64
    Desktop: KDE Plasma v: 5.24.6 Distro: Manjaro Linux
  Type: Laptop System: HUAWEI product: MACH-WX9 v: M14
    serial: <superuser required>
  Mobo: HUAWEI model: MACH-WX9-PCB v: M14 serial: <superuser required>
    UEFI: HUAWEI v: 1.28 date: 03/15/2019
  ID-1: BAT0 charge: 23.5 Wh (47.5%) condition: 49.5/56.3 Wh (87.9%)
    volts: 7.7 min: 7.6
  Info: quad core model: Intel Core i7-8550U bits: 64 type: MT MCP cache:
    L2: 1024 KiB
  Speed (MHz): avg: 800 min/max: 400/4000 cores: 1: 800 2: 800 3: 800
    4: 800 5: 800 6: 800 7: 800 8: 800
  Device-1: Intel UHD Graphics 620 driver: i915 v: kernel
  Device-2: NVIDIA GP108M [GeForce MX150] driver: nvidia v: 515.65.01
  Device-3: Cheng Uei Precision Industry (Foxlink) HD Camera type: USB
    driver: uvcvideo
  Display: x11 server: X.Org v: 21.1.4 with: Xwayland v: 22.1.3 driver: X:
    loaded: modesetting,nvidia gpu: i915 resolution: 3000x2000~60Hz
  OpenGL: renderer: Mesa Intel UHD Graphics 620 (KBL GT2) v: 4.6 Mesa
  Device-1: Intel Sunrise Point-LP HD Audio driver: snd_hda_intel
  Sound Server-1: ALSA v: k5.18.17-1-MANJARO running: yes
  Sound Server-2: PulseAudio v: 16.1 running: yes
  Sound Server-3: PipeWire v: 0.3.56 running: yes
  Device-1: Intel Wireless 8265 / 8275 driver: iwlwifi
  IF: wlp60s0 state: up mac: 34:2e:b6:8f:f1:8a
  Device-1: Intel Bluetooth wireless interface type: USB driver: btusb
  Report: rfkill ID: hci0 state: up address: see --recommends
  Local Storage: total: 476.94 GiB used: 221.67 GiB (46.5%)
  ID-1: /dev/nvme0n1 vendor: Toshiba model: N/A size: 476.94 GiB
  ID-1: / size: 39.01 GiB used: 31.13 GiB (79.8%) fs: ext4
    dev: /dev/nvme0n1p3
  ID-2: /home size: 392.64 GiB used: 190.53 GiB (48.5%) fs: ext4
    dev: /dev/dm-0
  ID-1: swap-1 type: partition size: 15.43 GiB used: 820 KiB (0.0%)
    dev: /dev/nvme0n1p5
  System Temperatures: cpu: 56.0 C pch: 49.5 C mobo: N/A
  Fan Speeds (RPM): N/A
  Processes: 292 Uptime: 1d 12h 48m Memory: 15.38 GiB used: 6.54 GiB (42.5%)
  Shell: Zsh inxi: 3.3.20