When i drop the hda to unity, HEU_TerrainUtility.GetDetailMapFromPart() first been called, get correct data.

Then i change some parameter, HEU_TerrainUtility.GetDetailMapFromPart() just return same result as the first time.
I open the hip file to debug(HoudiniEngine->Debug->Open Scene in Houdini), the detail map is correct changed accord to the new parameter.

Why? And how could i debug this problem? because HEU_TerrainUtility.GetDetailMapFromPart() call some function in dll, so i can't debug this function.
Thanks.