Landscape Resample Tools does not keep Streaming Proxy

alone

1 Open a world composition persistent level and load its sublevels containing respective landscape streaming proxy. 

2 Use landscape change component size tool with resize mode to resample, then Apply

Results: The resample works but it merge all data in sublevel into the landscape actor in persistent level.  

Expected Results: The resample works and it keeps the tiled landscape data in their respective sub level.