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This includes tests for a "static" mesh where the materials have been assigned and are expected to remain the same over time. The test scenario also includes a "dynamic" mesh where both new faces and new materials are assigned to the same mesh over time (inspired by #118754). However, that cannot be tested right now due to missing features of both the MeshSequenceCache and our USD IO code. No testing will occur for that case until the features are implemented. Pull Request: https://projects.blender.org/blender/blender/pulls/128341