This seems new as I don’t recall this line of question.
To explain better, the part where the spouse fills personal history, there is a part where you have to fill info of all your relatives... mom, dad , etc.
For my spouse, her sister is in the US on a study visa which expired I think August but she is still in th US.
So while filling hers, there is a question- country of residence (where she must be residing legally).
My spouse isn’t sure what country to put without misrepresenting because honestly, she is in the US.
Leaving her out is omission as such, misrepresentation