I took the index in the words, converted the selection to binary, extra 3 zeros, calculated the sha256 digest, took the very first Portion of the hexadecimal to convert it to binary, extra 3 zeros to your 8 digits with the binary and received 00000010011 which translates to 19 in https://bookmarkindexing.com/story18763158/invalid-bip39-phrase-things-to-know-before-you-buy