I took the index of your words, transformed the number to binary, additional 3 zeros, calculated the sha256 digest, took the 1st Element of the hexadecimal to convert it to binary, included three zeros towards the 8 digits from the binary and received 00000010011 which interprets to 19 in decimal. https://redhotbookmarks.com/story18814276/the-invalid-bip39-phrase-diaries