The generator matrix

 1  0  0  1  1  1  6  1  1  2  1  1  4  4  1  1  1  1  1  1  1
 0  1  0  1  6  3  1  0  1  1  2  3  1  2  2  0  2  2  0  0  0
 0  0  1  1  3  6  3  6  3  1  1  0  2  1  2  3  2  1  0  0  0
 0  0  0  4  0  0  0  0  0  4  0  4  4  0  0  0  4  4  0  0  0
 0  0  0  0  4  0  0  0  0  0  0  4  4  4  4  4  0  0  0  0  0
 0  0  0  0  0  4  0  0  0  0  4  0  4  4  4  4  4  4  0  0  0
 0  0  0  0  0  0  4  0  0  4  4  4  4  4  0  4  0  4  0  0  4
 0  0  0  0  0  0  0  4  0  4  0  4  0  4  0  4  4  0  0  0  4
 0  0  0  0  0  0  0  0  4  4  4  0  0  4  0  0  4  4  0  4  0

generates a code of length 21 over Z8 who´s minimum homogenous weight is 12.

Homogenous weight enumerator: w(x)=1x^0+44x^12+24x^13+139x^14+224x^15+518x^16+1296x^17+2229x^18+3648x^19+5256x^20+6048x^21+5278x^22+3552x^23+2224x^24+1328x^25+506x^26+256x^27+140x^28+8x^29+39x^30+9x^32+1x^34

The gray image is a code over GF(2) with n=84, k=15 and d=24.
This code was found by Heurico 1.16 in 3.38 seconds.