Keyboard Clean Tool still lets very long presses trough

I discovered your great Software "Keyboard Clean Tool".
I also use Cheatsheet. And so I discovered, that holding the cmd-key for longer than 3 seconds still gets trough when the Clean Tool is on. I know that for cleaning thats not an enormous problem. But since the tool claims to block all keypresses its unexpected behaviour imho.

MacBook Pro (15-inch, 2018)
Keyboard Clean Tool v3
Macos: 10.15.6

all the best