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A 3mf saved without a plate thumbnail, such as a CLI export with no OpenGL context or a backup, still listed /Metadata/plate_1.png and plate_1_small.png in _rels/.rels. lib3mf rejects a package whose thumbnail relationship points at a missing part. The writer now records which plate thumbnails it wrote and only declares those.
OrcaSlicer tests
Building, running and writing tests is documented on the wiki, under How to Test.
Two files here rather than there, because coding agents only read what is in the repository: