[Bug?] Trimmed surface's Isocurves missing at the seam position

Isocurves missing at the surface seam position.gh (10.3 KB)
As titled. Is this a bug?

hello
Although I do not understand the exact reason for this
But with this component, the problem is solved.


Isocurves missing at the surface seam position1.gh (13.2 KB)

I must also say that when using the range component, the value of x-1 should be entered in the “S” parameter.