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No, the dictionary is correct. You are confusing the transitive verb "conserve" with the adjective "conserved" meaning kept intact or unchanged in this particular sentence. Admittedly, Webster doesn't do a good job of explaining it. Preserved is a similar word. Think of preserved strawberries, or the historical district with conserved 1890s houses.
Conserve can sometimes be intransitive as well, such as "We will need to conserve on water if this drought continues."