Windows sometimes flicker when switching workspaces

[sedmicha]

System:    Kernel: 5.4.0-74-generic x86_64 bits: 64 compiler: gcc v: 9.3.0 Desktop: Cinnamon 5.0.5 
           wm: muffin dm: LightDM Distro: Linux Mint 20.2 Uma base: Ubuntu 20.04 focal 
 
Graphics:  Device-1: Intel HD Graphics 620 vendor: Acer Incorporated ALI driver: i915 v: kernel 
           bus ID: 00:02.0 chip ID: 8086:5916 
           Display: x11 server: X.Org 1.20.9 driver: modesetting unloaded: fbdev,vesa 
           resolution: 1920x1080~60Hz 
           OpenGL: renderer: Mesa Intel HD Graphics 620 (KBL GT2) v: 4.6 Mesa 20.2.6 
           direct render: Yes 

Issue
Windows sometimes flicker when switching workspaces.

Steps to reproduce
The flicker doesn't always happen, it seems like it depends on the windows open, but under these conditions I could reproduce it every time

• Have window animations and workspace OSD enabled (the default)
• Close all your windows
• Open a window on workspace 1, not maximized
• Switch to workspace 2
• Switch back to workspace 1
• The window will flicker as the animation happens

Expected behaviour

Windows don't flicker.

Other information

This only seems to happen when switching workspaces from right to left, left to right seems to work fine. Disabling windows animations or workspace OSD gets rid of the issue. I have not noticed this issue before upgrading to Linux Mint 20.2 (but maybe I was just lucky enough to never hit the right conditions for it). I could also reproduce the issue on a live boot of a freshly downloaded Linux Mint 20.2.

[icarter09]

Cinnamon 5.0.5
Mint 20.2 64bit

Haven't been able to reproduce this, but will keep working between two workspaces to see if something triggers the issue.