Error Performing BooleanOperation (Intersect) on Regions

[artillis_prado]

I'm developing a .NET application for AutoCAD where I create two Regions from Polylines and add them to ModelSpace. When attempting to perform BooleanOperation(BooleanOperationType.BoolIntersect), I receive the following error:

The Boolean operation on solid and/or surface bodies failed. Error Code Number is 60030.

I have verified that both Polylines are closed and that the Regions are created correctly. The issue might be related to coplanarity or another API limitation.
Has anyone encountered this error before and knows how to resolve it?"

regionPoly.AddToDocument(modelSpace, acT);
regionBoundary.AddToDocument(modelSpace, acT);

regionPoly.BooleanOperation(
    BooleanOperationType.BoolIntersect, 
    regionBoundary);

[ActivistInvestor]

Not sure what exactly your image shows.  How about posting a reproducible case in a DWG file?

[artillis_prado]

https://drive.google.com/file/d/150r2JPD6EkRJ3xQuCj18YYiNX8mxytS5/view?usp=sharing