An internal document has been leaked, revealing that Apple did indeed use a protective membrane under its new MacBook Pro keyboard to prevent dust from entering the problematic butterfly mechanism.
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Apple won't be replacing your defective MacBook keyboard with the version found on its new MacBook Pros. The new keyboard features a protective membrane around its problematic butterfly mechanism.
Apple has stated that the keyboard on the new MacBook Pro lineup won't fix sticky key issues. Yet, a teardown has revealed that the new keyboard might include a measure of protection to prevent it.