I took the index from the words, transformed the range to binary, added a few zeros, calculated the sha256 digest, took the initial Section of the hexadecimal to convert it to binary, extra three zeros to your 8 digits in the binary and got 00000010011 which translates to 19 in https://getsocialselling.com/story4223618/facts-about-bip39-seed-phrase-word-list-revealed