https://aescripts.com/slice-it-up/

Procedural and non-destructive way to slice things in After Effects.

• Slice it Up is a tool that cuts footage into any number of slices by duplicating it N times and applying random width masks to it. Those pieces are brought into one composition later and laid one over another to create an undistorted image. The tool provides controls to set random or linear offset to X, Y and Z position for each slice, adjust the expansion and rotation angles for the mask.  One of the most flexible things that Slice It Up provides is the ability to randomise slices in the UI panel at any time. If you don't like the width of your slices and feel like a change up, just randomise them in UI. If randomised position is not your taste, re-randomise it at any time without loosing your keyframes even after closing and opening the project.