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@tsnao, fair point. I assume now that these RV are defined on the same space. I also added the "dependence vanishing condition". Would it help somehow?
@tsnao, thank you for the comment, I corrected the question, there was a typo: $X_n$ and $Y_n$ could be dependent, but $\tilde{X}_n$ and $\tilde{Y}_n$ are independent for any $n$.