5.4 chaos cloth issue, garment seams deatach when start simulating

hi guys i’m having an issue with the Marvelous designer to unreal chaos cloth workflow.

i followed the steps in this tutorial : Panel Cloth - Editor Walkthrough & Updates (5.4) | Tutorial

but when i start the simulation the panels seams just disconects and the garment falls.

in the picture above I have pinned the belt so its easier to see.

what this could be?

I solved it. When I was exporting the garment from marvelous i forgot to unfreeze it. Now its working.