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[Pirates of the Caribbean] At the end of Dead Men Tell No Tales, Poseidon's Trident has been destroyed and thus every curse on the sea broken, how can Davy Jones actually be back? (According to the end credit scene)

So at the end of POTC 5, every curse in the sea has been broken and Will is finally freed from the Flying Dutchman and returns to Elizabeth. 

In the epilogue, we see Will having a nightmare where Davy Jones walks into his house while he sleeps with Elizabeth. He wakes up, scared, realizes it was just a dream and goes back to sleep. The camera pans down and we see barnacles on the floor, indicating that the it maybe wasn't a dream.

Now, as a thought experiment, how can Davy Jones plausibly be back? What part of "breaking every curse on the sea" revives him? And if every curse is broken, why would he still be a fish monster and not human?

I know the easy answer is bad writing, that it's just a stinger they threw in there to entice fans. But what would be an in-universe explanation?
gpt
Potentially every curse being broken means every curse is rewound to a point before it was enacted. So Davy Jones never enacted the curse that allowed him to cut his heart out and place it in the Dead Man's Chest, thus bringing him back to life.

This therefore would mean that he is back to being human though. So therefore the lobster claw would have just have had to have been a dream, and walking out of the sea can bring water and barnacles with you even in human form.

Alternatively, maybe Davy Jones transforming into a non-human form isn't considered a curse; it was just a normal effect of becoming one with the sea so effectively. In this scenario, either he survived his heart being stabbed, or his heart being stabbed allowing him to die was considered a curse, and with that curse broken he was able to return to life.

One other possibility is that the dream was way more metaphorical than it appears. That despite Will believing he is free of the Flying Dutchman, there is actually something that still draws him to it (perhaps the fact that someone needs to ferry souls to the afterlife still). Thus Will may be sleepwalking and still unknowingly piloting the Flying Dutchman in his sleep, and his subconscious envisions this as Davy Jones returning to claim him.