I've noticed some odd behaviour when using the equation driven curve feature in a 3D sketch.
When I create a parametric curve, I expect it to be fully defined, no matter what the curve is. However, I've found that sometimes the curve element changes between fully defined and underdefined depending on how I parametrise it. For example, if I set (arbitrary example)
x_t: 21.43228719 + 5 + 10*t
y_t: 15.0875 + 0.5*(1-cos(pi*t))*(15.0875-3.175)
the curve shows up as fully defined. But, with
the endpoints come out as fully defined, but the body of the curve remains blue, and the element is listed as underdefined.