the def is attached
plane X brep bug.gh (29.8 KB)
It is a known limitation with intersection when there is a singularity (the point at the lower tip of your brep). I’ll add your example to the bug list. For now, you workaround it using the following solution. I hope this helps
plane X brep bug_RI.gh (11.4 KB)
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thank you for the clarification and the workaround!