No need to go into the frustrations of rendaku mistakes
I wonder if Wanikani would consider a new feature where, when the mistake was made because of a rendaku, it would be flagged as such and you would be able to look at them as a separate group of mistakes in your summary?
These are words you “know” but have a specific type of problem with, so perhaps it would be useful to be able to isolate them?
I think this would be useful as well.
I tend to struggle with rendaku and it’s usually the main reason I end up adding my own reading notes. Whenever rendaku is involved, I’ve gotten into the habit of creating my own mnemonic to remember it.