Found it. I was using slow level translators with the shuttle board, and fast ones with my custom board. It seems that the load capacitance of BHI360 SPI pins was too low for the 74LV125T1 and things were ringing. Connecting an oscilloscope probe would fix it. For now, I have "fixed" the problem with 10pF (edit : 32pF) in parallel with BHI360 pins. BHI360 is working without any issues now, I'm just puzzled by this behaviour 🙂
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