That's genius! I could never do that during level design so I thought it was impossible. I'll fix this. Thank you very much for the finding!
Viewing post in Managed to lock myself into an area I should be
I'm that stubborn idiot that will sometimes try repeatedly to do the "nobody's gonna do that" thing just to see what happens. This time it wasn't intentionally me being a dink, though. I had one diamond left to find and I knew that section down there hadn't been cleared yet. It was the only place I could think of, and the challenge at that point (for me at least) was roughly where that leap of faith seemed like a good potential for where I needed to go... until I got there and cooked my savegame lol.