The "Get Tangent at Distance Along Spline" node returns incorrect tangent values compared to "Get Location and Tangent at Spline Point", where the spline point is at the same distance along the path.
If querying a point at a certain distance along a spline, its is expected to return the same location and tangent as querying a point placed at that same distance along the spline.
Getting the tangent by distance returns a different value. Trying to create a spline mesh using that tangent will end up with at distorted and/or twisted mesh.
This issue was reported in 4.19.2 (CL-4033788) and reproduced in 4.18.3 (CL-3832480), 4.20 (CL-4212847), and Main 4.21 (CL- 4217587)
Results: The two sets of value are different.
Expected: The two sets of values are the same.
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There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-61908 in the post.