My Resolution won't change, despite being different in the Launcher

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I am on a 4K monitor, but I want to play Rust in 3200x1800 or 2560x1440 for the performance. However, whenever I select a different resolution in the launcher, it will always go back to my native resolution.
Is there a way I can lock the resolution at one of these without having to set my desktop resolution as one of them?
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