i did not know exactly, but it seems something has changed. i do roll back to version 3.0 and found it worked again. mesh option need to be set properly
i exported to readable in PrePoMax as UNV and shown below, it’s solvable but i did not check further.
i will try again to the latest version 4.x and hopes it’s working also with many improvement.
*edited
it seems to be right, an algorithm for hex-dominant mesh with R-tree is not available there.
