In this scenario a person that has been dead for less than 10 days is Reincarnated. Their old body is still there. Someone then casts Speak with Dead on the body.
Question: Would the Speak with Dead spell work?
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Speak with dead clearly states that:
This spell doesn't return the creature's soul to its body, only its animating spirit.
Which comes to mean that the corpse itself is animated as a sort of puppet, retaining the memories it organically had while it lived. Since this is separate from the soul, the now reincarnated guy wouldn't even know this was happening.