So I was trying to create a custom regex for a note type. Although the regex was correctly matching I couldn't get the plugin to generate notes using that regex. I assumed that the plugin was maybe adding some flags or handling it in some weird way so I kept trying to switch up the regex but without any success.

So I ended up checking the obsidian's console and I saw that my note was indeed matching but was not being created: Failed to add note { Note JSON } due to error cannot create note because it is a duplicate.
I looked into it and found that the error was due to AnkiConnect as it's being called with:

{
  "options": {
    "allowDuplicate": false,
    "duplicateScope": "deck"
  }
}

It appears that AnkiConnect checks whether a note is duplicate or not by comparing the main field of the note. While this is arguably not a good idea on their side, I believe we should set allowDuplicate" to true` as this hidden behaviour is probably not what most users want. At least for me, it did cause much headache.

I'm opening a PR for this issue if it welcome.