Today I just had a game that was a classic case of this, with 52 rolls but not a single 6. I'm not sure how this is even possible. We were 3 players and the one player absolutely dominated the game as another player and I depended on the 6 for wood. End game results were 12 to 2 to 2, clearly a consequence of dice that seemed ''rigged'' against 6s (not realistic).

Dice rolls:
2: 1
3: 3
4: 6
5: 8
6: 0
7: 6
8: 14
9: 6
10: 3
11: 4
12: 1