Panning the canvas produces artefacts

Panning the canvas produces artefacts on version 1.0 when the elements in the viewport touch the viewport border or when zooming in and out. Testing on Ubuntu 20.04 under both X and Wayland yielded the same result.

OS: Ubuntu 20.04 LTS x86_64 
Host: Inspiron 13-7359 
Kernel: 5.4.0-29-generic 
Uptime: 6 hours, 55 mins 
Packages: 1912 (dpkg), 45 (flatpak), 32 (snap)
Shell: bash 5.0.16 
Resolution: 1920x1080 
DE: GNOME 
WM: Mutter 
WM Theme: Adwaita 
Theme: Adwaita-dark [GTK2/3] 
Icons: Yaru [GTK2/3] 
Terminal: gnome-terminal 
CPU: Intel i7-6500U (4) @ 3.100GHz 
GPU: Intel Skylake GT2 [HD Graphics 520] 
Memory: 7275MiB / 7818MiB 

Example with zooming (this is one rectangle but is being broken while zooming):