This fix wont work. its something to do with the game having it permanent when you save. Whats needed is a moon jump off code though it does not exist.
I installed HollowKnight on my Switch and did some research on this…
I used AIO to install the moonjump cheat
Confirmed that it was in place at /atmosphere/contents/0100633007D48000/cheats/…
Here is the contents of the cheat itself…
Here is the toggle.txt showing that it’s state is true…
Be me. Jumping all the way to the top of the screen (sproing!)…
Exited out of game and changed
true to
false…
Start game back up and now HollowKnight has no vert skill, loses NBA contract, loses house, loses car, loses wife…has no vert game. Don’t be like HollowKnight. Get good!

(Sorry picture is off center…hard to capture peak of jump while holding 12.9 iPad with one hand to take photo.)
It’s possible I’m missing something? If somebody wants to share a ”stuck” game save I’m happy to test…
e: also went back to the beginning of the game and started fresh so I would get a save game when I hit Dartmouth. Was still able to turn off cheat as above.