I took the index of your words, converted the range to binary, added three zeros, calculated the sha256 digest, took the primary part of the hexadecimal to convert it to binary, extra a few zeros for the eight digits of the binary and received 00000010011 which interprets to 19 in https://todaybookmarks.com/story19594727/new-step-by-step-map-for-bip39-english-words