I think this was added in 1.0.157 under “Added backticks to auto-wrapping quotes”.
I place a lot of source code in my notes, and Joplin is helpfully adding what it thinks is the right number of balanced quotes. Needless to say, this causes a lot of backspacing, etc. as I change two or four backticks back to three…
I find it very useful and I vote also to keep it.
For others, did you consider, for these kind of documents, type it in another editor and then copy/paste it into Joplin editor ?
I think it makes sense to have a toggle for this one given that there is no right answer. Everybody seems to have a personal preference and it doesn’t make sense for everybody to have to use the same default.