How to reproduce:
1. Open given Unity project
2. Enter "SampleScene" scene
3. Enter Play Mode
4. Notice incorrect results in the console
5. Open "Float4x4Test" script and change function arguments (a, b) order to (b ,a) in line 17
6. Notice correct results in the console

Expected result: Output in the console should be http://www.wolframalpha.com/input/?i=%5B%5B1,2,3,4%5D,%5B5,6,7,8%5D,%5B9,10,11,12%5D,%5B13,14,15,16%5D%5D*%5B%5B21,22,23,24%5D,%5B25,26,27,28%5D,%5B29,30,31,32%5D,%5B33,34,35,36%5D%5D
a*b = 290 300 310 320
722 748 774 800
1154 1196 1238 1280
1586 1644 1702 1760
Actual result: Output in the console is:
a*b = 650 740 830 920
762 868 974 1080
874 996 1118 1240
986 1124 1262 1400

Reproducible with: 2018.3.0a1, 2018.2.0b4