my mod is disabling vanilla features. please help.

When i create a new world (even in the test environment), all water mobs just don't spawn. I created an "ocean only" world, & the only mobs i saw were hostile mobs that spawned in caves. This started to happen when I ported my mod from 1.18.2 to 1.19.2. I just don't see any fish & squids (which are essential in my mod). I have no idea what's going on, but I will happily provide any files & extra info, when asked. 

Unrelated side note: right-clicking an empty bottle on water to fill it does nothing.

Is it a problem with the forge version MCreator is currently on? 

And how do I fix any of this?