I tried using it to speed through the deep water, but it causes some enemies to be invincible and makes you unable to pick up any items. Exiting the game completely fixes it, but now I gotta make sure not to use the boat unless I'm sure I'm at the top of the water.
For now I can only suggest to turn of the underwater feature of the megamod. You can find how to do it in the readme.md of this repository. (Sorry for the late reaction)
I tried using it to speed through the deep water, but it causes some enemies to be invincible and makes you unable to pick up any items. Exiting the game completely fixes it, but now I gotta make sure not to use the boat unless I'm sure I'm at the top of the water.