An issue that I keep seeing in Cardolan is with distant imposters. The distant trees aren't loading, only wireframe models. It makes the landscape look more fallout-like as the trees all look dead. I submitted a bug report a while ago but still hasn't gotten fixed.
There is a coded limit on the number of distant imposters that can be a part of the landscape. With more verdant areas, we can sometimes hit the cap on that, and "oddities" occur. For U35 - I removed imposters from a handful of bush assets to free up a TON of imposters for bigger assets such as trees. Hopefully, this change will help resolve imposter oddities in a number of places across the game world.