Flagged cards shown wrongly

I’m using

Anki 2.1.52 (a989e508) Python 3.9.7 Qt 6.3.0 PyQt 6.3.0
Platform: Mac 12.4
Flags: frz=True ao=False sv=3
Add-ons, last update check: 2022-05-27 09:42:14


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and observed a strangeness. I have a deck like

pic20220527101319

and it’s definitely empty


also the Rebuild states

But in my decks it shows

It will then show a card which in the past indeed was flagged red, but now it isn’t. Anyhow, even after closing the card comes back in the list.

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The search is applied when you (re)build the filtered deck, not after every change you make to a card.

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Well, if I try to rebuild it, there is nothing. Hence the message. But still it shows one card. And that one appeared “by itself” not in the course of rebuilding a deck.