Can you further explain how the transition occurs?
Does it “snap” from lower to higher quality, or does it “interpolate” from lower to higher quality?
A video would really help, because you have a graphical issue.
Also, just for my edification, you call it a “Landscape Spline”, but it’s only just a Mesh Spline that you’re using as a landscape, correct?
If this is not the case, there may be functionality from UE4+ that isn’t compatible with functionality with UE5+.
(PS: Make sure to hit the REPLY button on my responses so I actually get a notification.)