According to the USCIS, cancellation without prejudice is "[a] stamp an embassy or consulate
puts on a visa when there is a mistake in the visa or the visa is a duplicate visa (two of the same kind). It does not affect the validity of other visas in the passport. It does not mean that the passport holder will not get another visa."
Sometimes, it is cancelled without prejudice when there are two visa types that have intents attached but that are diametrically opposed to one another. H4 & H1 are not of the type.
And sometimes it happens at the border in the US when an alien has been incorrectly issued a visa from the US consulate abroad, or where there is an issue in the alien's immigration
history that would have caused them to lose the visa, but that has not yet been discovered.
There is no such thing as a list of scenarios where it would not be stamped with such a notification. It is not like everyone is presumed to get this stamped, unless one shows otherwise. So if there is no violation in the immigration history or if two visas are not diametrically opposed to one another, or the visa has not been incorrectly issued by the consulate, then this generally should not be an issue.
One final consideration is that an alien is given the privilege of entering the US and/or getting a visa. It is not a right, and therefore, the US consular officer ultimately has the authority to not issue, or cancel a visa, if there is a basis to do so.
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