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If you ask it to make an Equal Curvature relation, it adds an Equal Curvature and a Tangent.
If you ask for Tangent, you get only Tangent.
There are times when Equal Curvature gives bad results, but in those cases it should just give bad results, not eliminate the Equal Curvature. The only problem I can think of would be if the end condition creates a self intersecting spline, which is difficult to do in 3D.
Are you seeing something else? Do you have a sample file or a set of steps?