When creating a new filtered deck and putting the search string as “deck:French introduced:1” nothing happens in the Android app.
On my Mac this works perfectly fine.
Maybe a glitch in the Android app?
introduced was added in 2.1.45 (released in 2021-07-30), while AnkiDroid 2.15.6 was released in 2021-07-14, so the most likely reason is that it’s not supported yet.
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Sounds plausible. Thanks.