Silent う and い at the end of a word

Hey, I’m one year into learning japanese and thought I had my silent vowels down. When the [i] or [u] vowel occurs between two unvoiced consonants, it is silent. When they occur at the end of a word, after an invoiced consonant, they should also be silent (e.g. です).
Today I encountered the word 双節棍 (ぬんちゃく) and was very confused to find all pronunciations with a voiced う in く. Why does this happen? What’s the actual rule at the end of words?

by Sakaralchini

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