The copper lanterns don't change their lite levels based on the oxidation levels, but according to the features of copper lanterns the light levels should decrease with higher oxidation levels.
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Hi!
Thank you for your report!
However, this issue is Working as Intended.
Copper lanterns are supposed to provide a green light with the same light level as a normal lantern.
Please note, that mechanics of the game may change between updates.
Things such as graphics, sounds, world creation, biomes, redstone, villagers, and animals may not work the same in current versions.
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I am able to reproduce the reported behavior in a vanilla environment.