Open Inner Region Failed

Hello, I am facing a problem where my open inner region keeps failing, it happened for this new s Simscale update because before this, I had no problem applying the open inner region for the same model. can you please help me.

It keeps showing this matter. i have done merge the case in the boolean term, but seems not working

here are the link for my project https://www.simscale.com/workbench/?pid=8565241979365603358&mi=operation%3A22%2Cgeometry%3A21&mt=GEOMETRY_OPERATION