Front of Mia Japanese cards are blank

[AmodeusR]

Type:

• bug
• feature
• enhancement
• question

Environment:

• OS: Windows 10

I'm going to open a PR to resolve the issue:

• yes
• no

Description:

It actually happened to me more than once. The last time it happened I was adding some cards to Anki as I would, but I unintentionally clicked at "cards"(where we see the card type), didn't do anything else, and this error "the front of this card is blank" started to pop up. I could solve it after reinstalling Anki and doing the same thing.

This time around, though, the same error happened, but unlike last time, I didn't do anything. I just opened Anki next day and this error happened again. I tried the same tricks, opening and closing "cards", reinstalling, but nothing of it worked.

Anki's card are normal, but the custom Mia japanese card I made and the original Mia Japanese both stopped working properly, with this "The front of this card is blank" error.

Long history short, I tried reinstalling MiaJ but it said Anki 2.1.19(my version) wasn't supported, so I downloaded Anki 2.1.22 but Morphman didn't work, so I went to Anki 2.1.15 and reinstalled Mia Japanese through there, and MiaJ Cards started working again even in Anki 2.1.19, but my custom one didn't.

Here you can see the front/back of my custom card (I don't know if it helps, but...): https://gist.github.com/AmodeusR/1d6cfa972052e7c9858367b7d2713a2d

But before anything, it does not differ in nothing from the original, other than the field names, they are basically translated, use a text compare to see it. It was working fine for a long time and it just stopped working, that first time I said and now this time.

Edit: In the card type tab it shows the text working just fine: https://prnt.sc/s1hah6
it is only when I try to study it, it doesn't work.
Edit²: On Ankiweb cards work just fine, but for some reason, it doesn't on Anki Desktop App.

[AmodeusR]

It seems MIA actually mean Miss in Action, not anything else e.e More than 3 months and NOTHING of an answer. Congratulations 👌