I note that another user previously saw the “no current card” symptom after an undo operation while screen mirroring an iPad to a television: Odd menu bug (v. 24.11) - #2 by Standfast
I don’t think that I have the equipment to be able to try reproducing this bug? But, I’ll try to help collect more information about the issue.
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Could you please confirm, to connect the iPhone to an external monitor you are using a cable, not a mirroring app, correct?
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Are you connecting to the monitor via HDMI or are you using VGA?
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What monitor are you using? What are its basic specs?
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What adapter are you using? The “Lightning Digital AV Adapter”, “Lightning to VGA Adapter”, “USB-C Display AV Adapter”, or “USB-C VGA Multi-port Adapter” from Apple? Or, something else?
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What iPhone model do you have? What iOS version is it running?
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To undo, are you using the gear icon to go to the action screen and then pressing the “Undo Answer” button? Or, are you shaking the iPhone to undo? Or, using a gesture? Or, are you using a keyboard of some sort? (I assume that this probably doesn’t matter? But, just in case.)
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Are you using Anki in portrait or landscape mode? (I assume that this probably doesn’t matter? But, just in case.)
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And, could you please confirm: You’ve tried performing the same actions on your iPhone while not connected to an external monitor, and you’ve verified that the bug behavior doesn’t occur under those conditions, correct? That is, it appears that the external monitor is the only factor causing the bug to occur, correct?
Edit: (Deleted questions about add-ons. I had momentarily forgotten that there are no add-ons when using AnkiMobile.)