Searching with "-introduced:1" term not behaving as expected, filtering too many out

[szalejot]

Results from searches on my collection:

"deck:my deck" is:review rated:2 -is:learn - 634 cards selected
"deck:my deck" introduced:1 - 10 cards selected
"deck:my deck" is:review rated:2 -is:learn -introduced:1 - 10 cards selected

I would expect from the last search at least 624 cards selected: 634-10=624. But it swipes out almost all of the results.
Tested on 2.1.56 Qt6 on both Windows and MacOS.

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EDIT I have even simpler example. My collection has over 18.5k cards.

introduced:1 - 34 cards selected. This works properly.
-introduced:1 - 27 cards selected. Way too few IMHO. At first glance it looks, like it selects cards, that were studied today, but introduced earlier. Which is not exactly reversal of the flag.

[Rumo]

Has been reported here and is being dealt with:

Anki 2.1.56 Release Candidate

Windows 10 qt6, no add-ons This problem arised somewhere along the 2.1.55 beta phase, steps to reproduce: open a card with an input element (e.g. {{type:Text}}) and put the cursor inside it zoom enough for the scrollbar to appear unfocus the input field (e.g. click outside of it, or flip the card) → Anki will auto scroll to the bottom of the card -introduced:x seems bugged. It does not detect manually rescheduled cards, yet to be reviewed for the first time, which were new before using …