Accidentally, I stumbled upon this bit in gl 4.5, chapter 8.7 "Compressed Texture Images": "An INVALID_OPERATION error is generated by CompressedTexImage3D if internalformat is one of the EAC, ETC2, or RGTC formats and either border is non-zero, or target is not TEXTURE_2D_ARRAY." This forbids TEXTURE_CUBE_MAP_ARRAY as a target. Doesn't look like that's what mesa implements, nor does it make sense. This has to be a spec bug, right?
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