A villager in a minecart effectively despawned. At certain angles he appears, but I can't interact with him. Removing the blocks he's standing on or filling the space he occupies with blocks doesnt resolve the issue. He's vibrating slightly. He does not react to the player or anything else.
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Bug behavior is different than what you said it was a duplicate of. The villager entity disappears at an angle of the camera in respect to the world, not in respect to the screen distance. Also, it looks like that bug is a visual glitch, this is where a full villager entity becomes effectively useless.