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Photoshop's 16-bit PSBs can mark the merged transparency only by naming it "Transparency" in the alpha channel names (positive Lr16 layer count, no Mt16). The importer read it as a user alpha channel, and the next save wrote a second one. merged_has_alpha now also accepts that name when the layers sit in a global Lr16/Lr32 block and the names cover every extra channel. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>