Notes skipped even though note ID differs

As a test, I created two decks:

  • Deck A has its own deck ID, is own note type with its own ID. Let’s say fields A and B. I create one note with some values.
  • Deck B is identical but has its down deck ID and note type ID. But same fields and test note with same value as test note for deck A.

I import deck A. I import deck B. I get:

Notes found in file: 1
Notes skipped, as they’re already in your collection: 1
[Identical] moja (number), one

Yes, the values are identical, but the note IDs are different, so why is this note skipped?

Looking at deck A:

1|O);*8+=E!d|4231129472|1599622037|-1| |moja (number)one|moja (number)|0|0|

And deck B:

1|O);*8+=E!d|3135169473|1599622037|-1| |moja (number)one|moja (number)|0|0|

The mid is different. So why does Anki think they are the same?