Quick update in reply to my own question: VEXTRACTF128 should not support zmm registers. Therefore, the current behavior is correct. This is the reference: https://www.felixcloutier.com/x86/VEXTRACTF128:VEXTRACTF32x4:VEXTRACTF64x2:VEXTRACTF32x8:VEXTRACTF64x4.html
Anyway, supporting VEXTRACTF32x4 would help me.
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