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When Constructing bezier splines from dna, the positions of the left/right handles were set directly in the internal vectors, by requesting a reference to them. The problem is that BezierSpline::handle_positions_left() calls ensure_auto_handles() before returning the reference. That function does some calculations on uninitialized memory if the positions array is not yet filled. Differential Revision: https://developer.blender.org/D13107