Reseting the game in practice tool does not reset the crabs.
in practice tool, if you kill a crab and then reset the game, the crab will still be missing during first clear. It's a bit annoying if you are trying different jungle paths, or trying to improve your clear speed.
EDIT: Even if you don't kill any crab, reseting the game only spawns 1 on first clear. I'm struggling to practice atm.