Caused by rB35e3dc9192e7. Above commit moved 'Weight Paint' & 'Vertex Paint' keymap also before 'Paint Curve' keymap. This way, paintcurve.add_point_slide would be overriden by: - paint.vertex_paint (inverted) - paint.weight_sample Now move 'Paint Curve' above again. Reviewers: campbellbarton Maniphest Tasks: T84216 Differential Revision: https://developer.blender.org/D9939