After years of using these $1 counterfeit NRF modules, I just encountered one that doesn't work. It transmits messages OK, but it only receives all zero messages.
Had to fiddle a while (and build a spare gadget) to verify what I was seeing. Yup. Others receive the messages it sends properly, but whenever it receives a message is all zeros. It's not the MISO line or the gadget would never know a message had come.