The generator matrix

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

generates a code of length 21 over Z8 who´s minimum homogenous weight is 16.

Homogenous weight enumerator: w(x)=1x^0+303x^16+240x^18+1032x^20+1024x^21+864x^22+415x^24+176x^26+40x^28+1x^40

The gray image is a code over GF(2) with n=84, k=12 and d=32.
This code was found by Heurico 1.16 in 40.6 seconds.