Physics/Falling not working with Destructible Mesh and BluePrint

I’ve migrated from 4.10 to 4.11 to 4.12 to 4.13.

I’ve been working on this project for just about a year now.

Say the level is corrupt how do I either get it uncorrupt or get all of my current world assets over to the new map?

I’ve basically created an open world filled with forest, water, a mountain and so on.