Take care to make shape of the new step as close as possible to the shape of the existing steps. ( Height especially ) A small change in shape of stair in a flight of stairs can disorientate a person walking up or down the stairs and finding the "floor" of a step is not where they expect it to be ( compared the the rhythm of the previous steps). This disorientation can lead to a fall.
That said I did just that to create a space to enable some pipes to be re-routed.
The 2 inch difference from new step to landing floor level does confuse the feet.
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