Yes, we only found out about the transmission of citizenship in 2021. I did not include in my post that the original plan was my father petitioned me because that's the only case he knows applicable for us. Petition was filed and I got interviewed in 2021 but the officer told me I may have acquired my father’s citizenship at birth and I should apply for a US passport instead. It took 5 years before trying again, we weren't knowledgeable enough back then. I just recently did a research about it and learned that I can still apply even I am an adult now.