How to pause game while level sequence plays / How do I freeze a frame?

Hello,

I am trying to create a glitch effect and one part of it is to freeze a frame during a small time.
I have a post process material with different effects and I control it from a Level Sequence.

I was thinking of creating an Event Track that pauses the game using “Set Game Paused” node, but the sequence gets paused too and do not continue playing. The Level Sequence Actor has a setting “Tick when Paused” that should do the work, but it is disabled.

imagen

How can I enable that option??
Is there another way of achieving the same effect without pausing the game?