"10 by 6" is not quite a must - I've had NPCs living in rooms which only had 8x6 size. However, I don't think three blocks wide is enough - and last I checked, chairs on platforms could bug out.
Make the rooms wider, make sure chairs are not in platforms. Those are things I would try to fix that.
Try moving the solid block so that it is underneath the chair, and have the two platforms underneath the workbench. I know I've seen houses like this and that they CAN work.
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