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There were two problems: 1. `mesh_get_eval_final` has to be called with the evaluated object. 2. Particle systems have to have unique names within an object. The depsgraph seems to use the particle system name as identifier. This issue is actually independent of duplication. The old code used a small hack to create unique names. Reviewers: brecht Differential Revision: https://developer.blender.org/D4451