Megascan trees texture not fully loaded

Hello, I’m new to unreal engine and wanted to make a simple world for my project. I got an issue when using the megascan trees. It looks like it isn’t loaded fully until I open editor for that tree, and back again when I close the editor. Any idea? this is the when the editor closed and opened.


the issue only occure megascans from unreal marketplace. this is from quixel that’s working properly