Different MIME type reported for embedded buffers

[javagl]

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The validation report contains a section about the "resources", including the data URIs and their MIME type. The (embedded) Triangle sample model https://github.com/KhronosGroup/glTF-Sample-Models/blob/master/2.0/Triangle/glTF-Embedded/Triangle.gltf uses application/octet-stream as its MIME type. The report says that the MIME type was application/gltf-buffer. While both of them are valid, I wonder why the validator does not say what the real (declared) MIME type was.