Arguably, but go back to the post 53 situation, and consider the case where the electron beam is slowed down so as to only emit a single electron at a time.
The single electron emitted, in a traditional way of thinking, would only pass through one or the other of the two open slits, not both at the same time.
How does it “know” at the time it passes through one such slit whether the other slit is open so as to (together with its predecessor and successor brother electrons) produce a wave pattern on the screen, compared to the case when the other slit is closed, and no wave-like result is produced?
Again, this is not as if the electron is “aware” of the two slits, but rather, two slits guaranteeing a diminishing of the particle’s wave function. The mystery boils down to us not knowing what it is in multiple slits that causes the wave function to diminish, yes?
What would truly be baffling, is if the experiment were to be performed with two slits, each divided by a suitable partition from the other, throughout the length of the path the electron takes, and the experiment repeated.
If closing or opening one slit affected the other, in this arrangement, it would be amazing.
I make no claim on understanding how physical reality works, but in the "single electron" experiment, I don't think there is enough evidence to show an interference pattern, or even the "shades of brightness" inherent in the single slit arrangement.
The brightest at the center, dimming as one deviates from side to side, is a probabilistic artifact. any given particle has a probability of landing somewhere, more likely aligned with the source/slit line, probability of landing elsewhere depends on the angular deviation from that straight line.
So too, the interference pattern depends on more than one wave being present. Although a single wave will have peak/trough.
So, my semi-educated thought is that the observation is an artifact of probabilities, rather than a single electron literally interacting with two slits.
A single electron does not produce multiple impacts on the passive capture screen. Same for single proton, photon, etc.