I honestly am having a hard time describing this error, it may just be a bug. I've included a .blend file and screenshots as a reference.
I have a ship in a bottle on a plane with an ocean modifier, the plane also has booleans, so that the ship stays hollow. This works, but on frame 14 the ship suddenly fills with the entire ocean material.
I've been experimenting with the modifiers trying to figure out what the issue is. At this point I'm a bit lost.
I've also attached a blend. I'm completely lost, any advice would be greatly appreciated. Thank you in advance.