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@sjrcpa wrote:

For individuals, there is technically not a superseded return notation.

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There is now; they added that last year.  Although I don't really know why because the amended before the due date did the same thing.

Additionally, a new, electronic checkbox has been added for Forms 1040/1040-SR, 1040-NR and 1040-SS/1040-PR to indicate that a superseding return is being filed electronically.

https://www.irs.gov/newsroom/irs-taxpayers-now-have-more-options-to-correct-amend-returns-electronic...