I’ve wrote a small project that showcases the issue. In fact, in this project, I was unable to make collision work at all. I’ve modified the cable component on my side to show debug draws (replaced UWorld::SweepSingleByChannel with UKismetSystemLibrary::SphereTraceSingle) and we can see the collision occurring and the particles are slightly displaced for a brief moment, but the particle end up through the landscape.
The project is a single actor with a cube and a cable attached to it. The level blueprint moves the actor byt 2.5cm toward negative Z every frames. You should be able to press play and see the issue.
I’ve used 5.5.1-release.