I forked a mod another dude made for my personal use, uploading so my friends can download for our server.
I just made it so plants and pets weren't totally invincible to damage. They do have heightened health, if I recall I gave pets 3x vanilla, and plants 5x.
Plants SHOULD maintain salt water damage immunity but I still have to test that.
If I wasn't in a rush I'd find that mod to copy paste what else it changed but this is definitely not a final product, use it per your own risk and curiosity, I'll likely use this as the framework for other small QoL additions I made that I'll eventually release into something proper that wasn't clearly just s**t out .