Hey I’m working on a python script to solve this, should be available by end of month. But it only works for one lod level, I can look into more than 1 but no promises. Will post here when done.
In the meantime, maybe try moving your foliage meshes to the persistent level? I don’t know if that’s possible just thought of it now. Right click, move to current level (be sure perisetent level is current)