Course: Electric Dreams Environment: Unpacked

I am getting errors with the forest blueprint in 5.4 I know they made some changes but I dont know how to fix to get it to work. I checked other engines and it broke there now too.

I tried following the tutorial using 5.5 but after creating a loop spline and adding the tag, I tried to clear an area using it but i could not get it to clear an area. Has something changed?