When you use the action "Move Window One Space Left/Right," you may notice a brief flicker or blink after the window has been moved.
I set up this shortcut today, so I'm not sure if it has always been like this or if it's specific to the macOS version or Apple Silicon.
By the way, I hope it's okay to attach a video here; I believe it will help illustrate the issue. 
Screenshots
Action setup
Device information:
- Type of Mac: Mac Studio (M2)
- macOS version: Ventura 13.5 (22G74)
- BetterTouchTool version: 4.179
