You won't ever see an interference (or wave) pattern at the screen, as the beam splitter splits each photon into two entangled photons. As Sean Carroll says it: entanglement of any kind destroys interference. In this video I explain where the interference pattern actually comes from, and that there is no reason for retro causality: https://m.youtube.com/watch?v=e-uopGrghFQ

You won't ever see an interference (or wave) pattern at the screen, as the bbo crystal, right after the slits, splits each photon into two entangled photons. As Sean Carroll says it: entanglement of any kind destroys interference. In this video I explain where the interference pattern actually comes from, and that there is no reason for retro causality: https://m.youtube.com/watch?v=e-uopGrghFQ