I took the index from the words, converted the number to binary, additional a few zeros, calculated the sha256 digest, took the initial Component of the hexadecimal to transform it to binary, extra 3 zeros on the 8 digits of your binary and received 00000010011 which translates to 19 in https://ztndz.com/story21881516/the-ultimate-guide-to-bip39-seed-phrase-github