数独キラー №350914

I am close to finish 1000 sudoku killer achievement. Now one thing is interesting to me. When this kind of puzzle appear I remember that sometimes happens that two number can be in same area, if they are in different rows or columns or 3x3 blocks.

I also can not remember in last near 1400 solved killers that this situation were happen to me.

In rules of puzzles, nothing write about this. Does anyone knows does it rules are changed in meantime, or I simply not meet one of killers with this pattern.