Good chance the dual "furniture" is because "sitting in furniture" triggers a separate animation cycle. Then through root-motion animation the NPCs are climbing

Good chance the dual "furniture" is because "sitting in furniture" triggers a separate animation cycle. Then through root-motion animation the NPCs are climbing. Getting on switches NPCs to the climb animation set. Getting off the later swaps NPCs back to regular animation set. Altogether an elegant solution for managing what is otherwise a special case.