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The PBVH usually is rebuild after a topology change, so it does not make sense to keep the previous dynamic mesh preview vertex list. This may cause a crash is the number of vertices of the new mesh (and preview) is larger previous one. Now the list is deleted with the PBVH and a new one will be generated using the new mesh when the cursor is updated. Reviewed By: jbakker Maniphest Tasks: T71712 Differential Revision: https://developer.blender.org/D6476