Funny you mentioned marang. I have had a Marang right off the tree, and somewhere in my memory banks I made the connection to this gasoline smell. Definitely very pungent.
I could’ve cut it open and given it a taste test but if it was nasty, it would’ve been much more of a production to return it to the grocery store LOL
I just have never had quite that specific aroma in a jackfruit, so it spooked me a bit. Like I said, I love the wild smells but this one seemed “off”