Graphical artifacts near the window border when the window is resized

It's hard for me to guess why this happens, but this effect appears regardless of the compositor (xfwm4, compiz, picom...). GTK3 CSD windows are slightly less affected by this and so are Qt applications.

Maybe it's not even caused by the window manager, but by the GTK, I don't know.

output

Thoughts?

inxi -F
System:    Host: pc Kernel: 5.15.32-xanmod1 x86_64 bits: 64 Desktop: Xfce 4.16.0 Distro: Linux Mint 20.3 Una 
Machine:   Type: Desktop Mobo: Gigabyte model: B550M S2H v: x.x serial: <superuser/root required> 
           UEFI: American Megatrends LLC. v: F13 date: 07/08/2021 
CPU:       Topology: 6-Core model: AMD Ryzen 5 5600X bits: 64 type: MT MCP L2 cache: 3072 KiB 
           Speed: 4212 MHz min/max: 2200/3700 MHz Core speeds (MHz): 1: 4212 2: 3851 3: 4434 4: 3378 5: 3714 6: 4195 7: 4427 
           8: 3436 9: 4137 10: 4179 11: 4382 12: 4040 
Graphics:  Device-1: NVIDIA driver: nvidia v: 470.129.06 
           Display: x11 server: X.Org 1.20.13 driver: nvidia tty: N/A 
           OpenGL: renderer: NVIDIA GeForce RTX 3060 Ti/PCIe/SSE2 v: 4.6.0 NVIDIA 470.129.06 
Audio:     Device-1: NVIDIA driver: N/A 
           Device-2: Advanced Micro Devices [AMD] Starship/Matisse HD Audio driver: snd_hda_intel 
           Device-3: Smartlink USB2.0 type: USB driver: snd-usb-audio 
           Sound Server: ALSA v: k5.15.32-xanmod1 
Network:   Device-1: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet driver: r8169 
           IF: enp4s0 state: up speed: 1000 Mbps duplex: full mac: b4:2e:99:f4:5e:d5 
           IF-ID-1: vpn0 state: up speed: 10 Mbps duplex: full mac: N/A 
Drives:    Local Storage: total: 931.51 GiB used: 302.63 GiB (32.5%) 
           ID-1: /dev/nvme0n1 vendor: Western Digital model: WDS100T2B0C-00PXH0 size: 931.51 GiB 
Partition: ID-1: / size: 884.93 GiB used: 302.62 GiB (34.2%) fs: ext4 dev: /dev/nvme0n1p2 
           ID-2: swap-1 size: 31.37 GiB used: 8.6 MiB (0.0%) fs: swap dev: /dev/nvme0n1p3 
Sensors:   System Temperatures: cpu: 16.8 C mobo: N/A gpu: nvidia temp: 44 C 
           Fan Speeds (RPM): N/A gpu: nvidia fan: 0% 
Info:      Processes: 389 Uptime: 5d 18h 42m Memory: 31.36 GiB used: 6.52 GiB (20.8%) Shell: bash inxi: 3.0.38

xfwm4 --version

(xfwm4:1939178): dbind-WARNING **: 11:38:09.078: Couldn't register with accessibility bus: Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken.
	This is xfwm4 version 4.16.1 (revision 5f61a84ad) for Xfce 4.16
	Released under the terms of the GNU General Public License.
	Compiled against GTK+-3.24.20, using GTK+-3.24.20.

	Build configuration and supported features:
	- Startup notification support:                 Yes
	- XSync support:                                Yes
	- Render support:                               Yes
	- Xrandr support:                               Yes
	- Xpresent support:                             Yes
	- X Input 2 support:                            No
	- Embedded compositor:                          Yes
	- Epoxy support:                                Yes
	- KDE systray proxy (deprecated):               No