The active geometry element are usually updated by the cursor drawing code (as they are needed for the cursor preview) and when an sculpt operator starts. For brushes, this was not happening. This was making brushes rely by default on the last cursor drawing update, which can be incorrect if the mouse moved after starting the stroke without hovering the active geometry. Reviewed By: JacquesLucke Maniphest Tasks: T90236 Differential Revision: https://developer.blender.org/D12045