I just arrived at the same issue (Epic’s provided Lava Tile 2L doesn’t provide Lava Bounce/Damage) and used the solution of rebuilding a new Lava Prop. All credit goes to this video post https://www.youtube.com/watch?v=5cD3HC3EmM8. In 5 Minutes I was able to apply “Lava Physics” to an prop (in my case a standard cube) and it reproduced the same lava bounce and damage.