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Node 22 URL.createObjectURL strictly requires a native node:buffer Blob and throws ERR_INVALID_ARG_TYPE when given a jsdom Blob (caught by fetchImageAsBlob, returning ''). Node 24 relaxed this check, masking the failure locally. Tests 007, 011: replace MSW/Response-based fetch mocks with direct vi.spyOn(fetch) mocks returning node:buffer Blobs via a duck-typed response object. The real URL.createObjectURL now handles the correct Blob type and returns a genuine blob: URL on all Node versions. Test 012: URL.createObjectURL identity varies across Node versions making it impossible to spy on reliably. Replace createObjectURLSpy assertion with a completedFetches counter in the fetch mock, which proves the same semantic guarantee (6 requests ran, 7th was cleared). setup.ts: restore the original conditional guard so the vi.fn fallback only applies when URL.createObjectURL is completely absent, not overwriting a working real implementation.